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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3o2097

Which of the monochlorination products of 2-methylbutane are chiral?

A1-chloro-2-methylbutane
B2-chloro-2-methylbutane
C2-chloro-3-methylbutane
D1-chloro-3-methylbutane

Answer: A, C

A chiral molecule needs a carbon bonded to four different groups. In 1-chloro-2-methylbutane, C-2 bears H,

CH X_{3}

,

CH X_{2} Cl

and

C X_{2} H X_{5}

. In 2-chloro-3-methylbutane, C-2 bears H, Cl,

CH X_{3}

and

CH (CH X_{3}) X_{2}

. The other two have no such carbon.

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