Q. Which one of the nitrogen atoms in O $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \parallel \ \$ $H_{2}N - NH - C - NH_{2}$ is the most nucleophilic? I II III

A) III
B) I
C) II
D) All three N atoms
Explanation

(b)
When the nucleophilic site is the same, nucleophilicity parallels basicity. It means more basic the nucleophile, stronger is the nucleophile.
[image:12_image310.emf]is the most nucleophilic
[image:12_image311.emf]
Furthermore the $NH_{2}$ group away from the $–C -$group is not involved in resonance. Hence, its lone pair is reading available.

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.