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| Catalyst | Process |
| $(A)$ $TiCl_4$ | $(i)$ Wacker process |
| $(B)$ $PdCl_2$ | $(ii)$ Ziegler - Natta polymerization |
| $(C)$ $CuCl_2$ | $(iii)$ Contact process |
| $(D)$ $V_2O_5$ | $(iv)$ Deacon's process |
($i$) $P \xrightarrow[\text { ii) } \mathrm{Zn} / \mathrm{H}_2 \mathrm{O}]{\text { i) } \mathrm{O}_3 / \mathrm{CH}_2 \mathrm{Cl}_2} \underset{\left(\mathrm{C}_8 \mathrm{H}_8 \mathrm{O}\right)}{Q}$
($ii$) $R \xrightarrow[\text { ii) } \mathrm{Zn} / \mathrm{H}_2 \mathrm{O}]{\text { i) } \mathrm{O}_3 / \mathrm{CH}_2 \mathrm{Cl}_2} \underset{\left(\mathrm{C}_8 \mathrm{H}_8 \mathrm{O}\right)}{S}$
The option(s) with suitable combination of $P$ and $R$, respectively, is(are)
