(A) alkene (drawn as a branched alkene, e.g. 2-methylhept-2-ene) , and the alkene KMnO _4 a ketone + a hydroxy-ketone. Identify the alkene.

JEE Main Chemistry question

, and the alkene a ketone + a hydroxy-ketone. Identify the alkene.

(A)2-methylhept-2-eneCorrect
(B)3-methylhept-3-ene
(C)2-methylhept-3-ene
(D)6-methylhept-2-ene

Answer: (A)

Solution

Oxidative cleavage of the trisubstituted alkene carbon [(CH)(pentyl)C=] gives a methyl ketone, and cleavage of the other, disubstituted alkene carbon (=CH–, bearing H and a short alkyl chain) gives an aldehyde

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Question ID VK-142387