In the ¹⁹ F NMR spectrum of PF₅, the number of signals and multiplicity, at room temperature are

Q50 · CSIR-NET Chemistry, December 2011

Paper: CSIR-NET December 2011 · Subject: Inorganic Chemistry · Chapter: Inorganic Spectroscopy · Topic: Inorganic Spectroscopy – General · Marks: 2 · Difficulty: Medium

In the ${ }^{19} \mathrm{F} \mathrm{NMR}$ spectrum of $\mathrm{PF}_{5}$, the number of signals and multiplicity, at room temperature are

(a)One, singlet

(b)One, doublet

(c)Two, doublet

(d)Two, singlet

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

PF₅ undergoes fast Berry pseudorotation at room temperature, so all five F are equivalent: one signal, split into a doublet by ³¹P.

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