MCQ
The most stable carbocation is
- ✓

- B

- C

- D






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$\begin{array}{*{20}{c}}
{\,{C_2}{H_5}} \\
{|\,\,\,\,\,} \\
{C{H_3} - C - C{H_2}Cl} \\
{|\,\,\,\,\,} \\
{\,{C_2}{H_5}}
\end{array}$
| $[R]$ (molar) | $1.0$ | $0.75$ | $0.40$ | $0.10$ |
| $\mathrm{t}$ (min.) | $0.0$ | $0.05$ | $0.12$ | $0.18$ |
The order of the reaction is

$HI \rightleftharpoons \frac {1}{2} H_{2(g)} + \frac{1}{2} I_{2(g)}$
is $8.0$. The equilibrium constant of the reaction
$H_{2( g )} + I_{2(g)} \rightleftharpoons 2HI_{ ( g )}$ will be
$A\xrightarrow{NaN{{O}_{2}}/HCl}B\xrightarrow{KCN}C\xrightarrow{{{H}_{3}}{{O}^{+}}}$ benzoic acid
The compound $ A$ is