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Reaction of carbonyl compound with one o...

Reaction of carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is:

A

a Grignard reagent

B

hydrazine in presence of feebly acidic solution

C

hydrocyanic acid

D

sodium hydrogen sulphite

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The correct Answer is:
B


While in all other case no elimination take place.
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  19. The most acidic hydrogen for the following compound

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  20. What is the product of the following reaction?

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