The ${ }^{31} \mathrm{P}\{1 \mathrm{H}\}$ NMR spectrum of cis- $\left[\mathrm{Pt}\left(\mathrm{PEt}_{3}\right)_{2} \mathrm{Cl}_{2}\right]\left({ }^{195} \mathrm{Pt}\right.$ (33.8\% abundance) $\mathrm{I}=1 / 2$; its other isotopes are (NMR inactive: ${ }^{31} \mathrm{P}: \mathrm{I}=1 / 2$ ) is comprised with satellite peaks of a
(a)triplet
(b)singlet
(c)doublet
(d)quartet
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
The two PEt₃ ligands of the cis complex are equivalent, so ³¹P{¹H} shows a singlet; the 33.8 % of molecules with ¹⁹⁵Pt (I = ½) add a pair of satellites (¹J_PtP) around it.