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(A) The structure of $2$-methylbutane is $CH_3-CH(CH_3)-CH_2-CH_3$. Monochlorination can occur at four different positions,resulting in four constitut

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$2$

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(A) The structure of $2$-methylbutane is $CH_3-CH(CH_3)-CH_2-CH_3$. Monochlorination can occur at four different positions,resulting in four constitutional isomers: $1$. $1$-chloro-$2$-methylbutane (chiral center at $C2$),$2$. $2$-chloro-$2$-methylbutane (achiral),$3$. $2$-chloro-$3$-methylbutane (chiral center at $C2$ and $C3$),$4$. $1$-chloro-$3$-methylbutane (achiral). Among these,$1$-chloro-$2$-methylbutane and $2$-chloro-$3$-methylbutane possess chiral centers and exist as pairs of enantiomers. Thus,there are $2$ pairs of enantiomers.

How many pairs of enantiomers are formed during the monochlorination of $2$-methylbutane?

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