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MolSynapse / Question bank / Aldehydes, Ketones and Carboxylic Acids / Oxidation and reduction of carbonyls (Clemmensen, Wolff-Kishner, Tollens, Fehling)

JEE Main levelSingle correct optionDifficulty 2 of 3co145

Which of the following ketones gives a silver mirror with Tollens reagent?

A $CH X_{3} COCH X_{3}$
B $CH X_{3} COCH (OH) CH X_{3}$
C $CH X_{3} COCH X_{2} CH X_{3}$
D $C X_{6} H X_{5} COCH X_{3}$

Answer: B

An alpha-hydroxy ketone (here 3-hydroxybutan-2-one) is oxidised by Tollens reagent through the

- CO - CH (OH) X^{-}

unit, giving a silver mirror. Simple ketones and acetophenone do not react.

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