MCQ
From given pair of compounds, in which first will undergo $S_N2$ faster :
- A

- B

- ✓$\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,} \\
{||\,\,\,\,\,\,\,\,\,} \\
{C{H_3} - C - C{H_2} - Cl}
\end{array}$ and $CH_3-CH_2-Cl$ - D




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$5 \mathrm{Fe}^{2+}+\mathrm{MnO}_{4}^{-}+8 \mathrm{H}^{+} \rightarrow \mathrm{Mn}^{2+}+4 \mathrm{H}_{2} \mathrm{O}+5 \mathrm{Fe}^{3+}$