[Olympiad] Which of the following compounds can exist as a pair of enantiomers?

2-bromopropane
2-bromobutane
1-bromobutane
2-methylpropane

📝 Detailed explanation

Enantiomers require a chiral center (a carbon bonded to 4 different groups).
In 2-bromobutane, the second carbon is bonded to: -H, -Br, -CH₃, and -CH₂CH₃.

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