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NEET levelSingle correct optionDifficulty 1 of 3o2176

3,3-Dimethylbut-1-ene reacts with $HCl$ . The major product is

A1-chloro-2,3-dimethylbutane
B2-chloro-2,3-dimethylbutane
C2-chloro-3,3-dimethylbutane
D1-chloro-3,3-dimethylbutane

Answer: B

Protonation gives the secondary cation

(CH X_{3}) X_{3} C - CH X^{+} - CH X_{3}

. A 1,2-methyl shift gives the tertiary cation

(CH X_{3}) X_{2} C X^{+} - CH (CH X_{3}) X_{2}

. Chloride captures it to give 2-chloro-2,3-dimethylbutane.

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