MCQ
Strongest nucleophile is
- A

- B

- ✓

- D$\begin{matrix}
O \\
|| \\
C{{H}_{3}}-C-\overset{\overset{\circleddash }{\mathop{\centerdot \,\,\centerdot }}\,}{\mathop{C}}\,{{H}_{2}} \\
\end{matrix}$




$Image$
Stability order of carbocations $=(3)>(1)>(4)>(3)$
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$\mathrm{CO}_2, \mathrm{NO}_2, \mathrm{H}_2 \mathrm{SO}_4, \mathrm{BF}_3, \mathrm{CH}_4, \mathrm{SiF}_4, \mathrm{ClO}_2, \mathrm{PCl}_5,$ $\mathrm{BeF}_2, \mathrm{C}_2 \mathrm{H}_6, \mathrm{CHCl}_3, \mathrm{CBr}_4$

$(I)$ $Na_2O_2$
$(II)$ $O_2 [AsF_6]$
$(III)$ $CsO_2$
$(IV)$ $O_2$