NEET Chemistry NEET PYQ-Aldehydes Ketones

  • question_answer
    Consider the reaction,        [AIPMT (M) 2012]
    \[RCHO+N{{H}_{2}}N{{H}_{2}}\xrightarrow[{}]{{}}RCH=N-N{{H}_{2}}\]What sort of reaction is it?

    A) Electrophilic addition elimination reaction

    B) Free   radical   addition   elimination   reaction                                 

    C) Electrophilic substitution elimination   reaction                                  

    D) Nucleophilic    addition    elimination   reaction

    Correct Answer: D

    Solution :

    [d]\[RCHO+\overset{..}{\mathop{N}}\,{{H}_{2}}N{{H}_{2}}\to RCH=N-N{{H}_{2}}+{{H}_{2}}O\] In this reaction \[-\overset{..}{\mathop{N}}\,{{H}_{2}}\]acts as nucleophilic species which adds on carbon. Therefore this is the case of nucleophilic addition reaction. Simultaneously, a mole of\[{{H}_{2}}O\]also eliminated. Therefore, overall this reaction is a nucleophilic addition elimination reaction.


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