3.3.6
Organic Analysis
Section 3.3.6 covers the identification of functional groups by test-tube reactions, mass spectrometry including the use of precise masses from high-resolution spectra to find a molecular formula, and infrared spectroscopy: characteristic absorptions, fingerprinting, the identification of bonds, functional groups and impurities, and the link between infrared absorption by carbon dioxide, methane and water vapour and global warming.
Revision Notes
Work through 3.3.6 Organic Analysis in a structured sequence.
Spectra
Mass Spectra of Organic Compounds
Mass spectra of organic compounds: molecular ion, m/z, fragmentation patterns, common fragments, M+2 peaks for chlorine and bromine.
Start revisingSpectroscopy
Infrared Spectroscopy
Infrared spectroscopy: bond vibrations, wavenumbers, characteristic absorptions of functional groups, broad O–H bands, the fingerprint region and identifying compounds.
Start revisingUnknowns
Identifying Unknown Compounds
Identifying unknown organic compounds: combining the molecular ion, fragmentation, infrared absorptions and chemical tests, with a worked example.
Start revising3.3.6 Organic Analysis – AQA A Level Chemistry
The following AQA specification points outline the knowledge and skills students are expected to demonstrate. Wording follows the AQA A Level Chemistry (7405) specification.
3.3.6.1 Identification of functional groups by test-tube reactions
3.3.6.2 Mass spectrometry
3.3.6.3 Infrared spectroscopy
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