Assertion(A) : Haloalkanes are more reactive than chloro benzene
Reason (R) : Partial double bond develops between C – Cl in chlorobenzene

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A and R are true ‘R’ does not explain A

A and R are true ‘R’ explains A

A is true R is false

Both A and R are false

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 develops in the bond which make it difficult for nucleophile to cleave C-Cl bond.

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