MCQ
Decreasing order towards $S_N I$ reaction for the following compounds is:
Image
  • A
    a $>$ c $>$ d $>$ b
  • B
    a $>$ b $>$ c $>$ d
  • C
    b $>$ d $>$ c $>$ a
  • D
    d $>$ b $>$ c $>$ a

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$\begin{array}{*{20}{c}}
  {C{O_2}H} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{O_2}H} 
\end{array} + \begin{array}{*{20}{c}}
  {C{H_2} - \mathop {OH}\limits^{18} } \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
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\end{array}\xrightarrow[\Delta ]{{{H^ + }}}$ $(A)$ ;

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