Edexcel A Level Chemistry Topic 6C Alkenes banner showing a C=C double bond with methyl and hydrogen groups on each carbon

Alkenes – Topic 6C

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Alkenes – Topic 6C

The Alkenes Topic 6C Edexcel A Level Chemistry course provides approximately 12 hours of guided learning. Students work through guided video teaching, auto-marked MCQ practice, teacher-marked short-answer questions, and a specification assignment with a personalised progress report.

Guided Learning
12 Hours
Video Lessons
145 mins
MCQ Assessments
90 Marks
SAQ Assessments
90 Marks

Guided video teaching

Virtual Lesson

The recorded lesson teaches the key chemistry and the exam technique needed to apply it accurately. Students pause during exam-practice sections, attempt questions independently, then review the worked explanations and the mark-scheme approach.

At a glance

What you get in this course

145 minutes of guided video

A full Topic 6C walkthrough covering every spec point, with worked exam questions and mark-scheme strategy built into the lesson.

90 marks of MCQ practice

Auto-marked MCQ quizzes with instant diagnostic feedback for every option. Repeat as many times as you like.

90 marks of written practice

Written-answer quizzes marked by a chemistry specialist, with per-mark feedback returned by the following Monday.

Spec-point tagged throughout

Every question maps to the Edexcel specification, so your scores roll up into your personal KASP Analytics dashboard.

Exam-technique baked in

The lesson teaches the chemistry and the exam wording. You learn what Edexcel actually rewards, not just the content.

Personalised progress report

A one-click PDF report at the end of the course shows your level on every spec point in colour-coded form.

What is KASP Analytics?

KASP (Knowledge Analytics & Spec-point Platform) tracks your progress at the level of individual specification points, not just whole quizzes. Every question you attempt on this course is mapped to the Edexcel spec point it assesses, so you always know exactly which parts of the specification you have mastered and which need another look.

Your topic dashboard

Every topic you have worked through is summarised here. At a glance you see how many questions you have attempted, what is still waiting to be marked, your total marks scored, and an overall score percentage on a colour-coded bar.

Hello, Sara

Here is how you are doing across the topics you have attempted.

Edexcel Chemistry
Topic Questions Attempted Pending Marks (Scored / Available) Score
Topic 6C: Alkenes 18 / 20 2 42.00 / 56.00
75.0%
Topic 6B: Energetics 22 / 28 4 31.50 / 64.00
49.2%

Spec point breakdown for a topic

Click into any topic and you see the full spec-point breakdown. Each row is a single Edexcel spec point with its official wording, your score on it, and how many questions you have answered against it. The colour tells you immediately where to focus.

Spec points: Topic 6C: Alkenes

Edexcel
Spec tag Description Questions Marks Score
6C.18 know the general formula for alkenes and that alkenes and cycloalkenes are unsaturated hydrocarbons 4 / 4 8.00 / 8.00
100.0%
6C.20 understand the bonding in alkenes in terms of σ- and π-bonds 3 / 3 5.00 / 6.00
83.3%
6C.22i understand the addition of hydrogen (nickel catalyst) to form an alkane; includes margarine manufacture by catalytic hydrogenation 2 / 2 3.00 / 4.00
75.0%
6C.22iii understand the addition of hydrogen halides to produce halogenoalkanes 2 / 2 2.50 / 5.00
50.0%
6C.24ii understand the mechanism of electrophilic addition of hydrogen halides, including addition to unsymmetrical alkenes 2 / 3 2.00 / 6.00
33.3%
6C.26 know that alkenes form polymers through addition polymerisation; identify repeat units from monomers and vice versa 0 / 2 0.00 / 0.00 Not yet attempted
Green 70 to 100%: secure mastery Orange 40 to 69%: some gaps Red 0 to 39%: needs attention Grey: not yet assessed

Printable progress report

One click and you can download a clean, branded Progress Report PDF for any topic. Useful for your own revision folder, for parents to see at a glance, or for tutors to plan focused sessions.

One report card per topic

A focused, one-glance view of how you are doing on every spec point in a single topic. Designed to mirror the on-screen dashboard, so the colours you see in your daily revision carry through to the printed record.

The branded navy header carries your name and the topic. Every spec point in the topic appears with its code and full requirement text, and the Level column on the right is colour-coded green through red so you can spot strengths and gaps at a glance. A built-in legend at the foot of the report keeps the meaning of each colour clear for anyone reading it: a parent, a tutor, or future you.

At a glance

What you get with this course

Spec-point level tracking

Every question is tagged to the exact Edexcel spec point it assesses, so your scores roll up cleanly to the specification.

Updates automatically

Submit a quiz and your dashboard updates right away. Short-answer questions appear as pending until they have been marked.

Built for Edexcel A Level

Wording, codes, and topic structure follow the Edexcel A Level Chemistry specification exactly, so your scores line up with the document you will be examined on.

Printable report

One-click PDF Progress Report per topic, in the same colour system, ready for your folder or for a tutor session.

Strongest and weakest areas

Your strongest spec points and the ones most worth revisiting are surfaced for every topic you work through.

Progress over time

A simple line chart shows how your overall score has trended across the days you have been studying.

PROGRESS
REPORT
Student Name: Sara Mitchell
Topic: Topic 6C: Alkenes
70-100% mastery 40-69% gaps 0-39% urgent not assessed
CODE
REQUIREMENT
LEVEL
6C.18
know the general formula for alkenes
6C.20
understand bonding in alkenes: σ- and π-bonds
6C.21
know the term 'electrophile'
6C.22i
addition of H₂ (Ni catalyst) to form alkane
6C.22ii
addition of halogens to produce dihalogenoalkanes
6C.22iii
addition of HX to produce halogenoalkanes
6C.22iv
addition of steam (acid catalyst) to produce alcohols
6C.22v
oxidation by acidified KMnO₄ to produce a diol
6C.25
qualitative test for C=C: bromine water
6C.24ii
mechanism: electrophilic addition of halogens
6C.24ii
mechanism: electrophilic addition of HX incl. unsymmetrical alkenes
6C.26
addition polymerisation; identify repeat units
6C.29i
polymer disposal: biodegradable polymers
6C.29ii
polymer disposal: removing toxic incineration gases
GRADING SYSTEM
Green indicates strong understanding and secure mastery of the requirement.
Orange shows partial understanding, with some gaps that need targeted improvement.
Red highlights a significant misconception or weak understanding that needs immediate attention.
Grey means not yet assessed: no questions have been attempted for this requirement.

What is the MCQ Bank?

The MCQ Bank for Topic 6C: Alkenes is an auto-marked, instant-feedback practice engine built from past Edexcel A Level paper questions. Every question is tagged to a specific Edexcel spec point, every option carries diagnostic feedback explaining the chemistry, and every quiz attempt feeds directly into your KASP Analytics dashboard. New questions are added to the bank every quarter – the figures below reflect the Q2 2026 snapshot.

Try a real Topic 6C MCQ

This is a genuine question from the Topic 6C Alkenes MCQ Bank. Click any option to reveal the diagnostic feedback for that choice, then expand the correct-answer panel at the bottom to see the full mechanism walkthrough.

Electrophilic addition of HBr to propene

6C.22iii (Edexcel) 6C.24ii (Edexcel)

Propene reacts with hydrogen bromide gas at room temperature to form a halogenoalkane. Which row correctly identifies the major product and the reason it is preferred?

Click an option to see feedback

A 1-bromopropane, because the H atom of HBr bonds preferentially to the more substituted carbon of the C=C.
Incorrect

The product is 2-bromopropane, but your reasoning is the wrong way round. In Markovnikov addition the hydrogen of HBr adds to the carbon already bearing more hydrogens (the less substituted carbon), not the more substituted one. The selectivity is driven by carbocation stability, not by where H prefers to bond.

B 2-bromopropane, because the secondary carbocation intermediate is more stable than the primary carbocation.
Correct

In the electrophilic addition mechanism, H+ adds across the C=C to give a carbocation. Attack onto C1 of propene gives a secondary carbocation on C2, which is stabilised by the inductive effect of two alkyl groups. Attack onto C2 would give a less stable primary carbocation. The bromide ion then attacks the more stable carbocation, giving 2-bromopropane as the major product. This is Markovnikov's rule.

C 1-bromopropane, because primary C−Br bonds are stronger than secondary C−Br bonds.
Incorrect

This is incorrect on two counts. The major product is 2-bromopropane, not 1-bromopropane, and the selectivity is not determined by C−Br bond strength. The decisive factor is the relative stability of the carbocation intermediate formed in the rate-determining step, not the strength of bonds in the final product.

D 2-bromopropane, because the bromide ion attacks the less sterically hindered carbon atom.
Incorrect

The product is right but the reason is wrong. Steric hindrance is not the controlling factor here. The bromide ion attacks the more stable carbocation, which happens to be at C2. The correct explanation is rooted in carbocation stability, not steric accessibility.

Show correct answer & full explanation →
General feedback

Electrophilic addition of HBr to an unsymmetrical alkene follows Markovnikov's rule. To predict the major product you must compare the two possible carbocation intermediates.

  • Step 1: The π electrons of the C=C attack the δ+ hydrogen of HBr.
  • Step 2: A C−H bond forms, leaving a carbocation on the other carbon. With propene this is either a 1° carbocation (CH3CH2CH2+) or a 2° carbocation (CH3CH+CH3).
  • Step 3: Br− attacks the more stable carbocation. The 2° carbocation is more stable due to inductive donation from two alkyl groups, so 2-bromopropane is the major product.
  • Bond strengths and steric hindrance are not the controlling factors. Carbocation stability is.

The correct answer is B.

Five quizzes, 90 marks of MCQ practice

The Topic 6C MCQ Bank is divided into five quizzes (A–E), each a single auto-marked attempt. Because every spec point is tested across multiple quizzes, your KASP scores reveal real improvement as you move from quiz A through E. New questions are added every quarter.

Topic 6C: Alkenes – MCQ quizzes

Q2 2026 snapshot 90 marks total
MCQ A
20
marks
MCQ B
20
marks
MCQ C
20
marks
MCQ D
20
marks
MCQ E
10
marks
86 total marks One attempt per quiz Auto-marked on submit Updated quarterly

Your quiz review

Once you submit a quiz, Moodle shows a clean review screen. You see your overall score, a per-question breakdown, the spec point that was being tested, and a one-click route back into any question you want to study further.

Quiz review – Topic 6C MCQ A

Attempt completed 14 March, 19:42

Score
18 / 22
82%
Question Spec point Mark Result
Identifying the C=C functional group test 6C.25 1 / 1 Correct
E/Z naming of 2-methylpent-2-ene 6C.21 1 / 1 Correct
Electrophilic addition of HBr to propene 6C.24ii 0 / 1 Incorrect
Repeat unit of poly(propene) 6C.26 1 / 1 Correct
Oxidation by acidified KMnO4 6C.22v 1 / 1 Correct
… and 17 more questions – – –
Tip: Click any incorrect row to reopen that question, re-read the diagnostic feedback, and revisit the linked spec point on your KASP dashboard.

At a glance

What you get with the MCQ Bank

90 marks, five quizzes

MCQs A–D carry 20 marks each; MCQ E carries 6 marks. Together they provide balanced coverage of every Topic 5 spec point. New questions are added every quarter.

Instant auto-marking

Submit and the result is back in your hands inside a second. No waiting, no manual checking.

Diagnostic feedback per option

Every wrong option carries a tailored explanation of the misconception, not just a generic “incorrect”.

Spec-point tagged

Each question is mapped to the Edexcel spec point it assesses, so your score flows straight into KASP Analytics.

Track improvement across quizzes

One attempt per quiz, but the same spec points appear across MCQs A through E. Your scores from quiz to quiz show genuine progress, not repeat-attempt inflation.

Built from past papers

Every MCQ is sourced from genuine Edexcel A Level past papers, with the wording polished for clarity and the chemistry verified.

What is the SAQ Bank?

The SAQ Bank for Topic 6C: Alkenes is a written-answer practice engine marked by a real chemistry specialist. You attempt one quiz per week, submit your full written response, and your teacher returns mark-by-mark feedback the following Monday. Every comment is targeted at the exam wording you need to use. New questions are added to the bank every quarter – the figures below reflect the Q2 2026 snapshot.

A submitted SAQ and the feedback it gets

This is a genuine question from the Topic 6C Alkenes SAQ Bank with a real student answer already submitted. Click below to view the marked-up feedback returned by the chemistry specialist.

Geometric isomerism in but-2-ene and but-1-ene

5.2 (Edexcel) [4 marks]

Explain, in terms of bonding, why but-2-ene exhibits geometric (E−Z) isomerism whereas but-1-ene does not. [4]

Student's submitted answer

But-2-ene has a C=C double bond which cannot rotate. It is fixed in place because of the double bond. Each of the two carbons in the double bond has a methyl group and a hydrogen atom attached, so the methyl groups can be arranged on the same side (Z) or on opposite sides (E), giving two different isomers. In but-1-ene, the end carbon of the double bond has two hydrogen atoms attached, so swapping them does not create a different molecule, and so but-1-ene does not show geometric isomerism.
View returned feedback →
Returned by your chemistry specialist
Mr Hassan – returned Mon 17 March
Score
3 / 4
75%

Your answer (annotated)

But-2-ene has a C=C double bond which cannot rotate. It is fixed in place because of the double bond. Each of the two carbons in the double bond has a methyl group and a hydrogen atom attached, so the methyl groups can be arranged on the same side (Z) or on opposite sides (E), giving two different isomers. In but-1-ene, the end carbon of the double bond has two hydrogen atoms attached, so swapping them does not create a different molecule, and so but-1-ene does not show geometric isomerism.

Mark scheme

✓
Restricted rotation around the C=C double bond. Awarded – you explicitly said the C=C cannot rotate.
✗
Rotation is restricted because of the π bond (sideways overlap of p-orbitals). Not awarded. You said the C=C “cannot rotate” but didn't explain why. To earn this mark, state that the π bond is formed by sideways overlap of p-orbitals, and that rotating around the C=C would break this π bond, which requires too much energy at room temperature.
✓
Each carbon of the C=C in but-2-ene has two different groups (CH3 and H). Awarded – cleanly identified.
✓
One carbon of the C=C in but-1-ene has two identical groups (two H atoms), so no E/Z isomerism. Awarded – nicely contrasted against but-2-ene.

Teacher comment

Strong structural answer, Sara. You've nailed the geometric reasoning for why but-2-ene can show E/Z and why but-1-ene can't. The one mark you've left on the table is the bonding explanation behind restricted rotation. Examiners want to see the words “π bond” and “sideways overlap of p-orbitals” explicitly, not just “cannot rotate”. Bank that phrase for your next E/Z question.

A predictable weekly rhythm

One quiz per week. Submit anywhere from Monday to Friday, marking happens over the weekend, and you receive your feedback by the following Monday. The rhythm is the same every week so you always know when to expect a return.

Mon
Submit
Tue
Submit
Wed
Submit
Thu
Submit
Fri
Submit
Sat
Marking
Sun
Marking
Returned
Next Monday morning
Your marked SAQ lands back in your dashboard with per-mark feedback, model wording, and a teacher comment.
One attempt per quiz, one quiz submitted per week. Because the same spec points reappear across SAQs A through F, your scores from quiz to quiz show genuine improvement – not repeat-attempt inflation. The weekly cap also keeps the marking load manageable so your feedback stays genuinely thorough.

Six quizzes, 90 marks of written practice

The Topic 6C SAQ Bank is split into six quizzes (A–F). Quizzes A–E each contain 20 questions; quiz F contains the remaining questions. Each quiz draws from past Edexcel A Level written-paper questions and covers a spread of Topic 6C spec points. New questions are added every quarter.

Topic 6C: Alkenes – SAQ quizzes

Q2 2026 snapshot 90 marks total
SAQ A
20
questions
SAQ B
20
questions
SAQ C
20
questions
SAQ D
20
questions
SAQ E
10
questions
SAQ F
Remaining
questions
90 total marks 1 quiz per week Returned the following Monday Updated quarterly

At a glance

What you get with the SAQ Bank

90 marks, six quizzes

SAQs A–E each contain 20 questions; SAQ F contains the remaining questions. Mark values vary by question; total across all quizzes is 115 marks. New questions are added every quarter.

Marked by a chemistry specialist

Not auto-graded, not AI-scored. A subject specialist reads your answer end-to-end and writes the comments by hand.

Per-mark feedback

Every mark in the scheme is checked off explicitly. You see exactly which marks you earned and what wording the missed ones needed.

Predictable weekly turnaround

Submit by Friday, marked over the weekend, feedback returned by Monday. One quiz per week; one attempt per quiz.

Exam-board wording focus

Feedback teaches the precise language the Edexcel mark scheme rewards, so the next time the topic appears you write to score.

Feeds your KASP dashboard

Every SAQ is spec-point tagged. Once marked, your scores flow into KASP Analytics alongside your MCQ results.

2 reviews for Alkenes – Topic 6C

  1. David Jones (verified owner) –

    The T6C Alkenes course really helped improve my understanding of the topic. The explanations go into detail and break the content down clearly, which made some of the harder ideas much easier to understand. I liked the way the lessons and resources work through the topic step by step, and the videos explain everything clearly so it’s easy to follow. Overall it really helped improve my understanding of Alkenes.

  2. maryam (verified owner) –

    This Alkenes course made the topic much easier to understand. The videos explain everything step-by-step and go through the details properly, which helped me follow the reactions and mechanisms a lot better. I also liked how the lessons connect everything together instead of just giving information, so the whole topic makes more sense when revising. It really helped improve my understanding of Alkenes and made the topic feel much clearer.

Only logged in customers who have purchased this product may leave a review.

Exam Board Alignment

Alkenes Topic 6C Edexcel A Level Chemistry

This course covers the following Edexcel A Level Chemistry specification points:

18
know the general formula for alkenes
19
know that alkenes and cycloalkenes are unsaturated hydrocarbons
20
understand the bonding in alkenes in terms of σ- and π-bonds
21
know what is meant by the term electrophile
22
understand the addition reactions of alkenes with:
ihydrogen, in the presence of a nickel catalyst, to form an alkane
iihalogens to produce dihalogenoalkanes
iiihydrogen halides to produce halogenoalkanes
ivsteam, in the presence of an acid catalyst, to produce alcohols
vpotassium manganate(VII), in acid conditions, to oxidise the double bond and produce a diol
Knowledge of the application of catalytic hydrogenation to the manufacture of margarine from unsaturated vegetable oils is expected.
23
understand that heterolytic bond fission of a covalent bond results in the formation of ions
24
understand the mechanism of the electrophilic addition reactions between alkenes and:
ihalogens
iihydrogen halides, including addition to unsymmetrical alkenes
iiiother given binary compounds
Use of the curly arrow notation is expected. Curly arrows should start from either a bond or from a lone pair of electrons. Knowledge of the relative stability of primary, secondary and tertiary carbocation intermediates is expected.
25
know the qualitative test for a C=C double bond using bromine or bromine water
26
know that alkenes form polymers through addition polymerisation
Be able to identify the repeat unit of an addition polymer given the monomer, and vice versa.
27
know that waste polymers can be separated into specific types of polymer for:
irecycling
iiincineration to release energy
iiiuse as a feedstock for cracking
28
understand, in terms of the use of energy and resources over the life cycle of polymer products, that chemists can contribute to the more sustainable use of materials
29
understand how chemists limit the problems caused by polymer disposal by:
ideveloping biodegradable polymers
iiremoving toxic waste gases caused by incineration of plastics

Complete Topic Package

Learn the content, practise exam questions, and identify exactly where marks are being lost.

This course combines guided video teaching, diagnostic MCQs, teacher-marked written assessment, and detailed specification reporting for Edexcel A Level Chemistry.

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