Q18 · CSIR-NET Chemistry, June 2021

Paper: CSIR-NET June 2021 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy

Which of the following reaction(s) do(es) NOT occur
\[ \text{(i)}\quad [\mathrm{NPCl_2}]_3 + 6\,\mathrm{NaF} \xrightarrow[\text{Reflux}]{\mathrm{MeCN}} [\mathrm{NPF_2}]_3 + 6\,\mathrm{NaCl} \]
\[ \text{(ii)}\quad n\,\mathrm{PCl_5} + n\,\mathrm{NH_4Cl} \xrightarrow[\text{Reflux}]{\mathrm{C_6H_5Cl}} [\mathrm{NPCl_2}]_n + 4n\,\mathrm{HCl} \quad [n = 3, 4, 5, \ldots] \]
\[ \text{(iii)}\quad n\,\mathrm{PF_5} + n\,\mathrm{NH_4F} \xrightarrow[\text{Reflux}]{\mathrm{C_6H_5Cl}} [\mathrm{NPF_2}]_n + 4n\,\mathrm{HF} \quad [n = 3, 4, 5, \ldots] \]
(a)(i) and (iii)
(b)(i) and (ii)
(c)(i) only
(d)(iii) only
Answer
Answer: D ✓ checked by 4AB · confidence medium
Explanation
NaF exchanges (NPCl₂)₃ to (NPF₂)₃, and PCl₅ + NH₄Cl gives (NPCl₂)ₙ. PF₅ + NH₄F does not give (NPF₂)ₙ. (iii) only (d).

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