In the ${ }^{31} \mathrm{P}\left\{{ }^{1} \mathrm{H}\right\} \mathrm{NMR}$ spectrum of a diamagnetic complex $m e r-\left[\mathrm{M}\left(\mathrm{PR}_{3}\right)_{3} \mathrm{Cl}_{3}\right]$ 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).