Question
Under identical conditions, the $S_N1$ reaction will occur most efficiently with$:$
✓
Answer
$S_{N}1$ reaction is most effective in $3^\circ$ carbon.The order goes as
Tert $>$ secondary $>$ primary $>$ methyl
$\ce{(CH_3)_3−C−Cl}$ tert$−$butyl chloride$(3^\circ )$
$\ce{CH_3CH_2CH_2CH_2Cl 1−}$chlorobutane$(1^\circ )$
$\ce{Cl−CH_{2}−CH(CH_3)−CH_3}$
$\ce{CH_3CH_{2}CH(Cl)CH_3 2−}$chlorobutane$(2^\circ )$
Tert $>$ secondary $>$ primary $>$ methyl
$\ce{(CH_3)_3−C−Cl}$ tert$−$butyl chloride$(3^\circ )$
$\ce{CH_3CH_2CH_2CH_2Cl 1−}$chlorobutane$(1^\circ )$
$\ce{Cl−CH_{2}−CH(CH_3)−CH_3}$
$\ce{CH_3CH_{2}CH(Cl)CH_3 2−}$chlorobutane$(2^\circ )$
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