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  4. Assertion: Electrophilic substitution reactions in haloarenes occur slowly and require more drastic conditions as compared to those in benzene. Reason: Halogens are ortho and para-directors.

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Q. Assertion : Electrophilic substitution reactions in haloarenes occur slowly and require more drastic conditions as compared to those in benzene.
Reason : Halogens are ortho and para-directors.

Haloalkanes and Haloarenes

Solution:

Halogen atom because of its $-I$ effect has some tendency to withdraw electrons from the benzene ring, as a result, the ring gets somewhat deactivated as compared to benzene.