8.1. Aldehydes and ketones — Chemistry STD 12 Science — Question

$H{_2(g)} + 2ICl_{(g)} \to 2HCl_{(g)} + I_{2(g)}$

This reaction is of first order with respect to $H_{2(g)}$ and $ICl_{(g)}$ , following mechanisms were proposed

Mechanism $A$ :

$H{_2(g)} + 2ICl_{(g)} \to 2HCl_{(g)} + I_{2(g)}$

Mechanism $B$ :

$H_{2(g)} + ICl_{(g)} \to HCl_{(g)} + HI_{(g)}$  ;   Slow

$HI_{(g)} + ICl_{(g)} \to HCl_{(g)} + I_{2(g)}$  ;  Fast

Which of the above mechanism $(s)$ can be consistent with the given information about the reaction

$4M + 8CN^-+ 2H_2O + O_2 \rightarrow 4[M(CN)_2]^-+ 4OH^-$

$2[M(CN)_2]^-+ Zn \rightarrow [Zn(CN)_4]^{2-} + 2M$

$Time  (sec)$                     Rate $(mol\,  L^{-1} sec.^{-1})$

$0$                                      $1.60 \times 10^{-2}$

$10$                                    $1.60 \times 10^{-2}$

$20$                                    $1.60 \times 10^{-2}$

$30$                                    $1.60 \times 10^{-2}$

From the above data, the order of reaction is

$X$ (Major product) $\xrightarrow{HN{{O}_{3}}+{{H}_{2}}S{{O}_{4}}}Y$ (Major product)  $\xrightarrow{Sn\,\,+\,\,HCl}\,Z\,\xrightarrow[S{{O}_{3}}]{}W$

$W$ is