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Question

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

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

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.

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