Question

Chlorobenzene is ...... reactive than benzene towards electrophilic substitution and directs the incoming electrophile to the ...... position.

• A. more, ortho/para
• B. less, ortho/para
• C. more, meta
• D. less, meta

Answer 1

Answer: (B)

$-Cl$ group $(-7)$ of chlorobenzene being deactivating, deactivates the benzene nucleus towards electrophilic substitution.
Hence, chlorobenzene is less reactive as compared to benzene towards electrophilic substitution.
Moreover chlorobenzene has the following canonical forms:
From the above, it is clear that $Cl$-atom increases electron density at ortho and para-position.
Thus, it directs the incoming electrophile to the ortho/para position.