Which is the correct IUPAC name of the compound given below?
Correct answer: B. Phenylethanone
- A. Acetophenon
- B. Phenylethanone
- C. Phenyl ethanal
- D. Phenylacetate
Explanation
The correct IUPAC name for the compound is 'Phenylethanone'. This compound is a ketone with a phenyl group attached to the carbonyl group, which replaces one of the methyl groups in acetone. Option B is correct because it accurately represents the structure of the compound. Option A 'Acetophenon' is incorrect due to a spelling error, as the correct term is 'Acetophenone'. Option C, 'Phenyl ethanal', refers to an aldehyde, not a ketone. Option D, 'Phenylacetate', describes an ester, which does not match the ketone structure of the given compound.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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About Reactivity of Aldehydes and Ketones
The polar carbonyl group makes aldehydes and ketones undergo nucleophilic addition, reduction and condensation reactions. Aldehydes are generally more reactive and oxidise readily to carboxylic acids, whereas ketones resist mild oxidation; reactions with hydrogen cyanide, sodium bisulfite and 2,4-DNP help identify their behaviour.
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