In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at
(a)$1660\,\mathrm{cm}^{-1}$
(b)$1700\,\mathrm{cm}^{-1}$
(c)$1730\,\mathrm{cm}^{-1}$
(d)$1770 \mathrm{cm}^{-1}$
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; the p-nitro group withdraws further. p-Nitrophenyl acetate: ≈ 1770 cm⁻¹.