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  4. Under identical conditions, the SN1 reaction will occur most efficiently with

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Q. Under identical conditions, the $S_N1$ reaction will occur most efficiently with

WBJEEWBJEE 2012Haloalkanes and Haloarenes

Solution:

$S_{N^{1}}$ reaction is most effective in $3^{\circ}$ carbon.
$\underset{\text{tert-butyl chloride} \left(3^{\circ}\right)}{CH _{3} ) _{3}- C - Cl}\, \,\, \underset{\text{1-chlorobutane} \left(1^{\circ}\right)}{CH _{3} CH _{2} CH _{2} CH _{2} Cl}$
$\underset{\text{2-methyl 1 -chloropropane} \left(1^{\circ}\right)}{Cl - CH _{2}- CH \left( CH _{3}\right)- CH _{3}}$
$\underset{\text{2-chlorobutane} \left(2^{\circ}\right)}{CH _{3} CH _{2} CH ( Cl ) CH _{3}}$