Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by the overall effect of -I and + R effect of elimination of water. The reagent is

  1. A

    A Grignard reagent

  2. B

    Hydrazine in presence of feebly acidic solution 

  3. C

    Hydrocyanic acid

  4. D

    Sodium hydrogen sulphite 

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    Solution:

    • Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. 
    • The reagent is hydrazine in presence of feebly acidic solution.
    • For example, the reaction between acetone and hydrazine to form hydrazone is shown below.
    solution

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