CET Karnataka Medical
CET - Karnataka Medical Solved Paper-2011
question_answer
Which one of the nitrogen atoms in \[{{H}_{2}}\underset{I}{\mathop{N}}\,-\underset{II}{\mathop{N}}\,H-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-\underset{III}{\mathop{N}}\,{{H}_{2}}\] is the most nudeophilic?
A) III
B) I
C) II
D) All three nitrogen atoms are equally strong nudeophilic centres
Correct Answer:
B
Solution :
Electron present on nitrogen atom II and III takes part in conjugation with carbonyl group. Hence, due to this reason availability of electron present on these nitrogen atom decreases simultaneously nucleophilicity decreases. While electron present on nitrogen atom (I) do not take part in conjugation and are most nucleophilic in nature.