$PhMgBr$ સાથેની પ્રતિક્રિયાશીલતાનો સાચો ક્રમ કયો છે ?

$(I)$  $\begin{array}{*{20}{c}}
O \\
{||} \\
{Ph\, - C - Ph}
\end{array}$

$(II)$  $\begin{array}{*{20}{c}}
{\,\,\,\,O} \\
{\,\,\,\,||} \\
{C{H_3} - C - H}
\end{array}$

$(III)$  $\begin{array}{*{20}{c}}
O \\
{||} \\
{C{H_3} - C - C{H_3}}
\end{array}$

is

Question

$PhMgBr$ સાથેની પ્રતિક્રિયાશીલતાનો સાચો ક્રમ કયો છે ?

$(I)$ $\begin{array}{*{20}{c}}
O \\
{||} \\
{Ph\, - C - Ph}
\end{array}$

$(II)$ $\begin{array}{*{20}{c}}
{\,\,\,\,O} \\
{\,\,\,\,||} \\
{C{H_3} - C - H}
\end{array}$

$(III)$ $\begin{array}{*{20}{c}}
O \\
{||} \\
{C{H_3} - C - C{H_3}}
\end{array}$

is

IIT 2004, Medium

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Solution

c
(c) In nucleophilic addition reaction, the carbonyl compound will respond in preference which is sterically more exposed and electronically have intact positive charge over carbonyl carbon. So reactivity order towards reaction with $phMgBr$ is $(II) > (III) > (I).$

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