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Question

The major product H given in the reaction sequence is:


A

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B


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C

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D

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Solution

The correct option is A


First, the cyanohydrin formation happens. The oxygen of the then carbonyl could be protonated by a suitable proton source – be it acid, water, or something else. Next, the nitrile group is hydrolyzed and eventually, the concentrated acid dehydrates to give the αβ unsaturated acid.


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