Question

Identify incorrect statements.
I. Halo group activates benzene ring by mesomeric effect and destabilizes it by inductive effect.
II. Halo group is deactivating group.
III. Benzene is 10${}^4$ times more reactive than nitrobenzene towards nucleophile.
IV. $C{F}_3$ is a strongly deactivating group.

• A. I, II, III
• B. III only
• C. II only
• D. II, IV

Answer 1

Answer: (B)

III only

The statement (C) is incorrect statement.
Benzene is less reactive than nitrobenzene towards nucleophile.
In nucleophilic aromatic substitution reaction, the electron-withdrawing nitro group decreases electron density on benzene ring. This increases the electrophilic character of aromatic nucleus and facilitates nucleophilic attack.