Q76 · CSIR-NET Chemistry, December 2014

Paper: CSIR-NET December 2014 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: IR · Marks: 2 · Difficulty: Medium

In the IR spectrum, the absorption band due to carbonyl group in phenyl acetate appears at

(a)$\mathrm{1800 ~ cm}^{-\mathrm{1}}$

(b)$\mathrm{1760 ~ cm}^{-\mathrm{1}}$

(c)$\mathrm{1710 ~ cm}^{- \mathrm{1}}$

(d)$\mathrm{1660 ~ cm}^{-\mathrm{1}}$

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

Phenyl esters absorb at ≈1760 cm⁻¹ (higher than alkyl esters at 1740, because the aryl oxygen's lone pair is delocalised into the ring).

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