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Q.

Assertion (A): Chlorobenzene is less reactive towards nucleophilic substitution reaction
Reason (R): Nitro group in chlorobenzene increases reactivity nucleophilic substitution reaction.

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a

A is a false but R is true

b

A is true but R is false

c

Both A and R a true but are is not the correct explanation of A

d

Both A and R are true are is the correct explanation of A

answer is A.

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Detailed Solution

Chlorobenzene is less reactive towards nucleophilic substitution reaction due to the delocalization of the electrons of C-Cl bond and a partial double bond character develop in the bond which make it difficult for nucleophile to cleave C-Cl bond.
When Nitro group present at ortho and para position it withdraw electrons from benzene ring and helps to attack of Nucleophiles on haloarene.
that's why Nucleophilic Substitution increases.

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Assertion (A): Chlorobenzene is less reactive towards nucleophilic substitution reactionReason (R): Nitro group in chlorobenzene increases reactivity nucleophilic substitution reaction.