Question

Assertion : In case of aryl halides, halogens are moderately deactivating. Reason : Halogens are ortho, para directing groups.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

Halogens are moderately deactivating. Because of their strong $-$ $I$ effect, overall electron density on benzene ring decreases. Due to resonance, the electron density on $o$- and $p$- positions is greater than that at the m-position hence, they are $o$- and $p$- directing groups.