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Consider the reaction: $RCHO + NH_2NH_2 \rightarrow RCH=N-NH_2$. What sort of reaction is it?
A
Nucleophilic addition - elimination reaction
B
Electrophilic addition - elimination reaction
C
Free radical addition - elimination reaction
D
Electrophilic substitution elimination reaction
Detailed Solution
Hydrazine has a lone pair on nitrogen and acts as a nucleophile.
Step 1 (nucleophilic addition): $NH_2NH_2$ attacks the carbonyl carbon of RCHO to give $RCH(OH)-NH-NH_2$.
Step 2 (elimination): a molecule of water is lost to give the hydrazone $RCH=N-NH_2$.
So it is a nucleophilic addition–elimination reaction.
Step 1 (nucleophilic addition): $NH_2NH_2$ attacks the carbonyl carbon of RCHO to give $RCH(OH)-NH-NH_2$.
Step 2 (elimination): a molecule of water is lost to give the hydrazone $RCH=N-NH_2$.
So it is a nucleophilic addition–elimination reaction.