MCQ
Which pair will show common ion effect
- A$BaC{l_2} + Ba\,{(N{O_3})_2}$
- B$NaCl + HCl$
- ✓$N{H_4}OH + N{H_4}Cl$
- D$AgCN + KCN$

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Isomer $(P) \Rightarrow$ Can be prepared by Gabriel phthalimide synthesis
Isomer $(Q) \Rightarrow$ Reacts with Hinsberg's reagent to give solid insoluble in $NaOH$
Isomer (R) $\Rightarrow$ Reacts with $HONO$ followed by $\beta$-naphthol in $NaOH$ to give red dye.
Isomers $( P ),( Q )$ and $( R )$ respectively are
$CN ^{-}, NO ^{+}, O _{2}, O _{2}^{+}, O _{2}^{2+}$

