In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at
(a)$1670 \mathrm{cm}^{-1}$
(b)$1700 \mathrm{cm}^{-1}$
(c)$1730 \mathrm{cm}^{-1}$
(d)$1760 \mathrm{cm}^{-1}$.
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
An aryl acetate absorbs higher than a normal ester (1740 cm⁻¹) because the aryloxy oxygen is conjugated to the ring and donates less to the carbonyl; the p-nitro group withdraws further. p-Nitrophenyl acetate: ≈ 1760–1770 cm⁻¹.