MCQ
The one which is unimolecular reaction is
- A$2HI \to {H_2} + {I_2}$
- ✓${N_2}{O_5} \to {N_2}{O_4} + \frac{1}{2}{O_2}$
- C${H_2} + C{l_2} \to 2HCl$
- D$PC{l_3} + C{l_2} \to PC{l_5}$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$2PhCHO \xrightarrow{{:\mathop O\limits^ \ominus H}}PhC{H_2}OH + PhC\mathop {O_2^ \ominus }\limits^{.\,\,.\,\,} $
the slowest step is :

$Z\,\xrightarrow{{PC{l_5}}}\,X\,\xrightarrow[\Delta ]{{{\text{Alc}}{\text{.KOH}}}}\,Y\,\xrightarrow{{{H_2}O/{H^ \oplus }}}\,\mathop Z\limits_{{\text{(Major)}}} \,,\,\,Z$ is
$\begin{array}{*{20}{c}}
{C{H_3}}\\
{|\,\,\,\,\,}\\
{{C_6}{H_5}C{H_2} - C - C{H_2} - C{H_3}}\\
{|\,\,\,\,\,}\\
{Br\,\,\,}
\end{array}$ $\xrightarrow[{{C_2}{H_5}OH}]{{{C_2}{H_5}ONa}}$