Q6 · CSIR NET Chemistry, June 2017
Paper: CSIR NET June 2017 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: NMR 1H · Marks: 2 · Difficulty: Easy
${}^{13}\mathrm{C}$ NMR spectrum of DMSO-$d_6$ gives a signal at $\delta$ 39.7 ppm as a
(a)singlet
(b)triplet
(c)quintet
(d)septet
Answer
Answer (as printed): D
Explanation
Multiplicity: 2nI +1 Where n is number of neighboring protons and I is spin number of protons. For DMSO: n = 3, I = 1 (for D) Multiplicity = 2 ´ 3 ´ 1 +1 = 7.
Explanation as extracted from the printed page; notation may be imperfect.
Study loop for Organic Spectroscopy