Assertion (A): p-Methoxyphenol is a stronger acid than p-nitrophenol.
Reason (R): The methoxy group shows a +I effect whereas the nitro group shows a −I effect.
Reason (R): The methoxy group shows a +I effect whereas the nitro group shows a −I effect.
- (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- (B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- (C)Assertion (A) is true, but Reason (R) is false.
- (D)Assertion (A) is false, but Reason (R) is true.✓ Correct
Answer: (D)
Solution
−NO withdraws electrons and stabilises the phenoxide — p-nitrophenol is the \textit{stronger} acid; the electron-donating –OCH makes p-methoxyphenol weaker. So A is false.
The sign of the effects stated in R is correct (OCH donor, NO acceptor) — R is true.
Correct option: (D).
The sign of the effects stated in R is correct (OCH donor, NO acceptor) — R is true.
Correct option: (D).
CBSE Class 12 Board · 2024 · Single correct option