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| List $I$ Reaction | List $II$ Reagents |
| $A$ Hoffmann Degradation | $I$ Conc.KOH,$\Delta$ |
| $B$ Clemenson reduction | $II$ $CHCl _3, NaOH / H _3 O ^{+}$ |
| $C$ Cannizaro reaction | $III$ $Br _2, NaOH$ |
| $D$ Reimer-Tiemann reaction | $IV$ $Zn - Hg / HCl$ |
${\text{2PQ}} \rightleftharpoons {{\text{P}}_2}{\text{ + }}{{\text{Q}}_2}\,;\,\,\,\,{{\text{K}}_1}{\text{ = 2}}{\text{.5 }} \times \,{\text{1}}{{\text{0}}^5}\,$
${\text{PQ + }}\frac{1}{2}{R_2} \rightleftharpoons PQR\,;\,\,\,\,{{\text{K}}_2}{\text{ = 5 }} \times \,{\text{1}}{{\text{0}}^{ - 3}}\,$
The value of equilibrium constant for reaction
$\frac{1}{2}{{\text{P}}_2}{\text{ + }}\frac{1}{2}{{\text{Q}}_2}{\text{ + }}\frac{1}{2}{R_2} \rightleftharpoons PQR\,$ is