JEE Main · 2007 · 29 Apr 2007 · Offline · Hydrocarbons

The compound formed as a result of oxidation of ethyl benzene by

KMnO_{4}

(A)benzophenone
(B)acetophenone
(C)benzoic acid✓ Correct
(D)benzyl alcohol

Answer: (C)

Solution

A strong oxidant such as potassium permanganate attacks the benzylic carbon of an alkyl side chain and oxidises the whole chain, provided it bears a benzylic hydrogen, down to a carboxyl group on the ring. Ethyl benzene,

C_{6} H_{5} C H_{2} C H_{3}

, is thus cut back to a single carboxyl carbon, giving benzoic acid,

C_{6} H_{5} COOH

JEE Main · 2007 · 29 Apr 2007 · Offline · Single correct option

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