Which of the following molecules exists as a pair of enantiomers?

Question

A) 1-Bromo-3-methylbutane
B) 2-Cyclohexen-1-ol

Pls explain your choice. Thank you

Answer 1

The ring system in compound B forces the presence of a couple of enantiomers. The -OH group has to stick either "up" or "down".

Answer 2

Enantiomers are stereoisomers that are nonsuperimposable. mirror images.of each other.

A) 1-Bromo-3-methyl butane (or Isoamyl Bromide) has no optically active Carbon center (no enantiomers).

B) (R)-2-Cyclohexen-1-ol and (S)-2-Cyclohexen-1-ol are enantiomers (Carbon 1 is optically active and has 4 "different groups").