The compound most reactive towards S _ N 1 reaction is : - Vidyadip

MCQ

The compound most reactive towards $S _{ N } 1$ reaction is :

A
$MeCOCH _{2} Cl$
B
C
$C _{6} H _{5} CH _{2} CH _{2} Cl$
✓
$MeOCH _{2} Cl$

✓

Answer

Correct option: D.

$MeOCH _{2} Cl$

d
The $SN _{1}$ reaction for $MeCOCH _{2} Cl$ is given as,

$MeOCH _{2} Cl$ $\xrightarrow{Slow}$$\underset{(i)}{\mathop{Me\underset{\,\,\centerdot \,\,\centerdot }{\overset{\centerdot \,\,\centerdot }{\mathop{O}}}\,\overset{+}{\mathop{C{{H}_{2}}}}\,+C{{l}^{-}}}}\,$ $\leftrightarrow $ $\underset{(ii)}{\mathop{Me-\underset{\,\,\centerdot \,\,\centerdot }{\overset{+}{\mathop{O}}}\,=C{{H}_{2}}}}\,$

Though $(ii)$ contains positive charge on oxygen, octet around each atom in $(ii)$ is complete, structure $(ii)$ is more stable than $(i)$.

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