Question

The correct statement/s about the following reaction sequence is /are :

• A. 'R' gives an aldol condensation reaction on heating with NaOH solution
• B. The compound 'Q' gives a yellow precipitate in acetone
• C. Step '4' is an aromatic nucleophilic substitution reaction.
• D. The end product is a mixture of three compounds

Answer 1

Answer: (B), (C)

The correct options are
B The compound 'Q' gives a yellow precipitate in acetone
C Step '4' is an aromatic nucleophilic substitution reaction.

Compound Q is 2,4-dinitro phenyl hydrazine.
It reacts with acetone to form 2,4-dinitrophenyl hydrazone which forms a yellow precipitate.
In step 4, the chloride attached to aromatic nucleus is replaced by hydrazine to give 2,4-dinitrophenyl hydrazone.
In this reaction, hydrazine acts as a nucleophile.
Thus it is an aromatic nucleophilic substitution reaction.