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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3si005

Which of the following pairs can be distinguished by the single reagent indicated? (more than one may be correct)

Apentan-2-one and pentan-3-one: $NaOH / I X_{2}$
Bpropanal and propanone: 2,4-DNP
Cethanol and methanol: $NaOH / I X_{2}$
Dphenol and cyclohexanol: neutral $FeCl X_{3}$

Answer: A, C, D

Ethanol gives iodoform but methanol does not; pentan-2-one gives it but pentan-3-one does not; phenol gives a violet colour but cyclohexanol does not. Propanal and propanone are both carbonyl compounds and both give 2,4-DNP precipitates, so that pair is not distinguished.

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