Q5 · CSIR NET Chemistry, December 2018
Paper: CSIR NET December 2018 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: Organic Spectroscopy – General · Marks: 2 · Difficulty: Medium
In the $^{31}\mathrm{P}\{^{1}\mathrm{H}\}$ NMR spectrum of a diamagnetic complex $mer$–$[\mathrm{M}(\mathrm{PR}_3)_3\mathrm{Cl}_3]$ expected number of resonance is
(a)Three
(b)One
(c)Two
(d)Six
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
In mer-[M(PR₃)₃Cl₃] two phosphines are trans to each other (equivalent) and the third is trans to Cl, so there are two phosphorus environments and the ³¹P{¹H} spectrum shows two resonances (a doublet and a triplet, 2:1).
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