Question
Which of the following can undergo electrophilic substitution when treated with nitrous acid at $${0^ \circ }C?$$
A.
$${C_6}{H_5}N{H_2}$$
B.
$${C_6}{H_5}NHC{H_3}$$
C.
$${C_6}{H_5}N{\left( {C{H_3}} \right)_2}$$
D.
$${\text{None}}$$
Answer :
$${C_6}{H_5}N{\left( {C{H_3}} \right)_2}$$
Solution :
Nitrosonium $$ion,\mathop N\limits^ + O$$ from $$HONO$$ is a weak electrophile, hence it can attack only on highly activated benzene nucleus, provided proper position, $$p-$$ or $$o-$$ is free.
Nitrosonium $$ion,\mathop N\limits^ + O$$ from $$HONO$$ is a weak electrophile, hence it can attack only on highly activated benzene nucleus, provided proper position, $$p-$$ or $$o-$$ is free.