Consider the reaction, $$ R \mathrm{CHO}+\mathrm{NH}_2 \mathrm{NH}_2 \longrightarrow \mathrm{RCH}=\mathrm{N}-\mathrm{NH}_2 $$ What sort of reaction is it?

• A

  Electrophilic addition elimination reaction
• B

  Free radical addition elimination reaction
• C

  Electrophilic substitution elimination reaction
• Correct answer
  D

  Nucleophilic addition elimination reaction

Solution

In this reaction
acts as nucleophilic species which adds on carbon. Therefore this is the case of nucleophilic addition reaction. Simultaneously, a mole of $\mathrm{H}_2 \mathrm{O}$ also eliminated. Therefore, overall this reaction is a nucleophilic addition elimination reaction.

Hence, the correct answer is option: 'D'.