MCQ
Least reactive towards nucleophilic addition is
  • A
    $CH_2 = O$
  • B
    $\begin{array}{*{20}{c}}
      {CC{l_3} - C - H} \\ 
      {\,\,\,\,\,\,\,||} \\ 
      {\,\,\,\,\,\,\,\,O} 
    \end{array}$
  • $\begin{array}{*{20}{c}}
      {C{H_3} - C - {C_2}{H_5}} \\ 
      {\,\,\,\,\,\,\,||{\kern 1pt} \,\,\,\,\,\,\,} \\ 
      {\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,} 
    \end{array}$
  • D
    $\begin{array}{*{20}{c}}
      {C{H_3} - C - H} \\ 
      {\,\,\,\,\,\,\,\,\,\,\,||{\kern 1pt} \,\,\,\,\,\,\,} \\ 
      {\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,} 
    \end{array}$

Answer

Correct option: C.
$\begin{array}{*{20}{c}}
  {C{H_3} - C - {C_2}{H_5}} \\ 
  {\,\,\,\,\,\,\,||{\kern 1pt} \,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,} 
\end{array}$
c
Ketone are very less reactive towards $NAR$, due to steric crowding and $+\mathrm{I}$ effect.

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