- A$3$
- B$2$
- ✓$1$
- D$4$
$Cl\, \leftarrow \,\mathop {C{H_2}C{H_2}OH}\limits_{Stronger\,\,acid} \to \,$ $\,Cl\,\leftarrow \,\underset{\begin{smallmatrix}
-ve\,\,charge\,\,on\,\,O \\
dispersed\,\,hence
\\
conjugate\,\,base,\,stable
\end{smallmatrix}}{\mathop{C{{H}_{2}}C{{H}_{2}}{{O}^{-}}\,}}\,+\,{{H}^{+}}$
$\underset{Weaker \,\,acid}{\mathop{C{{H}_{3}}C{{H}_{2}}OH}}\,\,\to \underset{\begin{smallmatrix}
-\,\,ve\,\,charge\,\,\operatorname{int}ensified, \\
\,\,\,\,\,\,\,\,hence\,\,conjugatte
\\
\,\,\,\,\,\,\,\,base\,\,unstable
\end{smallmatrix}}{\mathop{C{{H}_{3}}\to \,C{{H}_{2}}{{O}^{-}}\,+}}\,\,{{H}^{+}}$
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${\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+},\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+},\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+},}$
${\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+},\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}}$
Item$-I$ Item$-II$
$(I)$ Benzene $( P )$ $HCl$ and $SnCl _{2}, H _{3} O ^{+}$
$(II)$ Benzonitrile $(Q)$ $H _{2}, Pd - BaSO _{4}, S$ and quinoline
$(III)$ Benzoyl Chloride $(R)$ $CO , HCl$ and $AlCl _{3}$