Chemistry · p-Block Elements (Group 15-18)

JEE Advanced 2024 — Paper 2 — Question 28

The species formed on fluorination of phosphorus pentachloride in a polar organic solvent are

Option A:
$\left[\mathrm{PF}_{4}\right]^{+}\left[\mathrm{PF}_{6}\right]^{-}$ and $\left[\mathrm{PCl}_{4}\right]^{+}\left[\mathrm{PF}_{6}\right]$
Option B:
$\left[\mathrm{PCl}_{4}\right]^{+}\left[\mathrm{PCl}_{4} \mathrm{~F}_{2}\right]^{-}$ and $\left[\mathrm{PCl}_{4}\right]^{+}\left[\mathrm{PF}_{6}\right]^{-}$
Correct
Option C:
$\mathrm{PF}_{3}$ and $\mathrm{PCl}_{3}$
Option D:
$\mathrm{PF}_{5}$ and $\mathrm{PCl}_{3}$

Answer: B

Step-by-step solution

On fluorination of $\mathrm{PCl}_{5}$ in polar organic solvent ionic isomers are formed, i.e. $\left[\mathrm{PCl}_{4}\right]^{+}\left[\mathrm{PCl}_{4} \mathrm{~F}_{2}\right]^{-} \rightarrow$

(Colourless crystal) $\left[\mathrm{PCl}_{4}\right]^{+}\left[\mathrm{PF}_{6}\right]^{-} \rightarrow($ White crystal)

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Exam: JEE Advanced 2024
Paper: Paper 2
Subject: Chemistry
Chapter: p-Block Elements (Group 15-18)
Topic: Compounds of other Group 15 elements - preparation and properties

The compound(s) having peroxide linkage is(are)

Answer: B

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