Q98 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: NMR 1H · Marks: 2 · Difficulty: Medium

The correct match of ${}^{13}\mathrm{C}$ NMR chemical shift values ($\delta$ ppm) for pyridine is
(a)$\mathrm{C_2}: 136, \mathrm{C_3}: 124; \mathrm{C_4}: 150$
(b)$\mathrm{C}_{2}: 124, \mathrm{C}_{3}: 150 ; \mathrm{C}_{4}: 136$
(c)$\mathrm{C}_{2}: 150, \mathrm{C}_{3}: 124 ; \mathrm{C}_{4}: 136$
(d)$\mathrm{C}_{2}: 150 ; \mathrm{C}_{3}: 136 ; \mathrm{C}_{4}: 124$
Answer
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Explanation
Pyridine ¹³C: C-2/6 150 (α to N), C-4 136, C-3/5 124 ppm.

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