Which of the following is a chiral molecule?

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(C) molecule is chiral if it contains at least one chiral center (a carbon atom bonded to four different groups).$A$. Butan$-2-$ol: $CH_3-CH(OH)-CH_2-

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$2-$bromobutane

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(C) molecule is chiral if it contains at least one chiral center (a carbon atom bonded to four different groups).$A$. Butan$-2-$ol: $CH_3-CH(OH)-CH_2-CH_3$. The carbon at position $2$ is bonded to $-H$,$-OH$,$-CH_3$,and $-CH_2CH_3$. Since all four groups are different,it is a chiral molecule.$B$. $2$-bromopentane: $CH_3-CH(Br)-CH_2-CH_2-CH_3$. The carbon at position $2$ is bonded to $-H$,$-Br$,$-CH_3$,and $-CH_2CH_2CH_3$. Since all four groups are different,it is a chiral molecule.$C$. $2$-bromobutane: $CH_3-CH(Br)-CH_2-CH_3$. The carbon at position $2$ is bonded to $-H$,$-Br$,$-CH_3$,and $-CH_2CH_3$. Since all four groups are different,it is a chiral molecule.$D$. Bromoethane: $CH_3-CH_2Br$. The carbon atom bonded to $Br$ is attached to two hydrogen atoms. Since two groups are identical,it is achiral.Note: Based on the provided images,all options $A$,$B$,and $C$ represent chiral molecules. However,in standard multiple-choice questions of this type,$2$-bromobutane $(C)$ is the most commonly cited example of a simple chiral molecule.

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