Q. $S_{N}1$ reaction is fastest in
A) $CH_{3}CH_{2}Cl$
B) [image:12_image66.emf]
C) $\ \ CH_{3}$
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$CH_{3} - C - Cl$
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$\ \ \ \ \ \ \ \ \ \ \ \ CH_{3}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \$
D) $CH_{3} - CH - Cl$
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$\ \ \ \ \ \ \ \ \ \ \ \ \ CH_{2}$
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$\ \ \ \ \ \ \ \ \ \ \ \ CH_{3}$
Explanation
(c)
The alkyl halide which produce stable carbonium ion undergo $S_{N}$1 reaction. Tertiary alkyl halide is most stable. Thus, decreasing order of tendency of alkyl halides undergoes $S_{N}1$ mechanism.
t-alkyl halide>sec-alkyl halide> primary-alkyl halide
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.