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NEET levelSingle correct optionDifficulty 1 of 3hx023

Which of the following undergoes $S_{N} 2$ reaction fastest with the same nucleophile under the same conditions?

A $(CH X_{3}) X_{3} CBr$
B $CH X_{3} Br$
C $(CH X_{3}) X_{2} CHBr$
D $CH X_{3} CH X_{2} Br$

Answer: B

In

S_{N} 2

, backside attack is hindered by alkyl groups. Reactivity order is methyl

>

primary

>

secondary

>

tertiary, so

CH X_{3} Br

reacts fastest.

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