Question

A greenish yellow gas A is liberated when KMNO₄reacts with HCl . A reacts with phosphorus to give compound B which on hydrolysis gives compound C and D. A reacts with excess NH₃to liberate colourless gas E.A reacts with conc NaOHto give salt F andG. Identify A B C D E F and give all the reactions required.

Answer 1

Dear Student,

$$\begin{gathered} {\mathrm{KMnO}}_4+\hspace{0.17em}\mathrm{HCl}\to \mathrm{KCl}+{\mathrm{MnCl}}_2+\hspace{0.17em}{\mathrm{H}}_2\mathrm{O}+{\mathrm{Cl}}_2 \\ \mathrm{So},\mathrm{the}\mathrm{greenish}\mathrm{yellow}\mathrm{gas}\mathrm{A}\mathrm{is}{\mathrm{Cl}}_2 \\ {\mathrm{Cl}}_2\mathrm{reacts}\mathrm{with}\mathrm{P}\mathrm{to}\mathrm{give}\mathrm{compound}\mathrm{B} \\ {\mathrm{P}}_4+10{\mathrm{Cl}}_2\to 4{\mathrm{PCl}}_5 \\ \mathrm{So},\mathrm{Compound}\mathrm{B}\mathrm{is}{\mathrm{PCl}}_5 \\ \mathrm{Now},{\mathrm{PCl}}_5+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{POCl}}_3+2\mathrm{HCl} \\ {\mathrm{PCl}}_5+4{\mathrm{H}}_2\mathrm{O}\to {\mathrm{H}}_3{\mathrm{PO}}_4+5\mathrm{HCl} \\ \mathrm{So},\mathrm{C}\mathrm{and}\mathrm{D}\mathrm{are}{\mathrm{POCl}}_3\mathrm{and}{\mathrm{H}}_3{\mathrm{PO}}_4\mathrm{respectively}. \\ 8{\mathrm{NH}}_3+3{\mathrm{Cl}}_2\to 6{\mathrm{NH}}_4\mathrm{Cl}+{\mathrm{N}}_2 \\ \mathrm{So},\mathrm{E}\mathrm{is}{\mathrm{N}}_2 \\ \mathrm{and},5{\mathrm{Cl}}_2+6\mathrm{NaOH}\to 5\mathrm{NaCl}+{\mathrm{NaClO}}_3+3{\mathrm{H}}_2\mathrm{O} \\ \mathrm{So},\mathrm{F}\mathrm{and}\mathrm{G}\mathrm{and}\mathrm{NaCl}\mathrm{and}{\mathrm{NaClO}}_3\mathrm{respectively}. \end{gathered}$$