Q19 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Organic Chemistry · Chapter: Natural Products · Topic: Natural Products – General · Marks: 2 · Difficulty: Easy

The natural product that gives signal at $\delta 218 \mathrm{ppm}$ in its ${ }^{13} \mathrm{C} \mathrm{NMR}$ spectrum
(a)$\alpha$-pinene
(b)camphor
(c)geraniol
(d)carvone
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
δ 218 ppm is a saturated ketone carbonyl: camphor. Carvone's conjugated ketone is at ≈199, geraniol and α-pinene have no C=O.

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