Question

Assertion: In mono haloarenes, further electrophilic substitution occurs at ortho and para positions.

Reason: Halogen atom is a ring deactivator.

• A. Assertion and reason both are correct and reason is the correct explanation of assertion.
• B. Assertion is correct but reason is wrong statement.
• C. Assertion is wrong but reason is correct statement.
• D. Assertion and reason both are correct statements but reason is not correct explanation of assertion.
• E. Assertion and reason both are wrong statements.

Answer 1

The correct option is D Assertion and reason both are correct statements but reason is not correct explanation of assertion.

Assertion:

In mono haloarenes, a halogen atom increases the electron density at ortho and para position. So, electrophilic substitution occurs at ortho and para positions. 

Halogens bonded to the benzene ring have three lone pairs. These lone pairs can cause resonance in the benzene ring and increase the electron density on the benzene ring.

So, assertion is correct.

Reason:

However, Halogens are also highly electronegative and have strong -I effect which for halogens overpowers the +R effect. So, they are deactivating groups.

So, the reason is correct.

Conclusion: Assertion and reason both are correct statements but reason is not correct explanation of assertion.

Hence the correct option is e.