Question

In electrophilic substitution reaction of chlorobenzene, the ortho/para- directing ability of chlorine is due to its

• A. Positive inductive effect (+I)
• B. Negative inductive effect (-I)
• C. Positive resonance effect (+R)
• D. Negative resonance effect (-R)

Answer 1

The correct option is C Positive resonance effect (+R)

In electrophilic aromatic substitution reaction of chlorobenzene, the ortho/para ability of chlorine is due to its positive resonance effect (+R). The lone pair of electron on chlorine is involved in delocalisation with benzene ring and increase the electron density at ortho and para positions.