Question

What will be the reactivity of chlorobenzene in an electrophilic substitution reaction with benzene?
Select one
A None
B. Reacts in the same way as benzene
C. Reacts very slowly than benzene
D. Reacts faster than benzene​

Answer 1

Answer:

The answer is C.

Explanation:

Since the electron density of the aromatic ring decrease and deactivates the ring and also chlorobenzene is ortho para activator,chlorobenzene is less reactive than benzene towards electrophilic substitution

Answer 2

OPTION (C) IS CORRECT.

(C) REACTS VERY SLOWLY THAN BENZENE

Explanation:

• Benzene is an aromatic ring which is rich in electron density due to resonance. That is why it undergoes electrophilic substitution reactions such as nitration, sulphonation, and halogenation.
• But when chlorine is attached to the benzene ring, the electron density on the benzene ring is reduced as chlorine is electronegative due to -I.
• But chlorine also shows +M due to the electron pair present on it, due to this it is ortho and para directing.
• Due to negative inductive  and positive mesomeric effect, the reactivity of chlorobenzene towards electrophilic substitution is reduced.
• Therefore, "option (C) reacts very slowly than benzene" is correct.