Correct order of stability is

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MCQ

A
$C{{H}_{3}}-\overset{\overset{\Theta }{\mathop{\centerdot \,\centerdot }}\,}{\mathop{C}}\,{{H}_{2}}\,>\,C{{H}_{2}}=\overset{\overset{\Theta }{\mathop{\centerdot \,\centerdot }}\,}{\mathop{C}}\,H\,>\,CH\,\equiv \,\overset{\overset{\Theta }{\mathop{\centerdot \,\centerdot }}\,}{\mathop{C}}\,$
B
$CH\equiv \overset{\centerdot }{\mathop{C}}\,>\,C{{H}_{2}}=\overset{\centerdot }{\mathop{C}}\,H\,>\,C{{H}_{3}}\,-\,\overset{\centerdot }{\mathop{C}}\,{{H}_{2}}$
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D
$C{{H}_{3}}-\overset{\oplus }{\mathop{C}}\,H-\,C{{H}_{3}}>\,C{{H}_{3}}\,-\,O-\overset{\oplus }{\mathop{C}}\,{{H}_{2}}$

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Answer

Correct option: C.

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For each of the following pairs of $E_2$ reaction, select the one that occurs with the greater rate constant.

$(1)$ $C{H_3}C{H_2}C{H_2}Cl + $ $\begin{array}{*{20}{c}}
{\,\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,C{H_3}} \\
{\,\,\,|}
\end{array}} \\
{C{H_3} - C - {O^ - }} \\
{\,\,\,|} \\
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\end{array}$ $(2)$ $C{H_3}C{H_2}C{H_2}I + $$\begin{array}{*{20}{c}}
{\,\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,C{H_3}} \\
{\,\,\,|}
\end{array}} \\
{C{H_3} - C - {O^ - }} \\
{\,\,\,|} \\
{\,\,\,\,\,\,\,\,\,\,C{H_3}}
\end{array}$

$(3)$ $\begin{array}{*{20}{c}}
{{H_3}C - CH - C{H_3}} \\
{|\,\,\,\,} \\
{Br\,\,\,}
\end{array}$ $+CH_3O^-$ $(4)$ $\begin{array}{*{20}{c}}
{{H_3}C - CH - C{H_3}} \\
{|\,\,\,\,} \\
{Br\,\,\,}
\end{array}$ $+CH_3S^-$