Question

Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): In monohaloarenes, further electrophilic substitution occurs at ortho and para positions.
Reason (R): Halogen atom is a ring deactivator.

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is not the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is B Both A and R are true but R is not the correct explanation of A

Halogen being more electronagative, acts as ring deactivator as they dominates -I effect over +m. However lone pairs on halogen delocalises in the ring which enable further electrophilic substitution at ortho and para positions.
Thus Assertion and Reason both are correct and Reason is not correct explanation of Assertion