(2R,3S)-2,3-dibromobutane is a meso compound and it is internally compensated hence it is optically inactive.
Stereoisomers are compounds that have the same molecular formula but different arrangement of atoms and groups in space. Stereoisomers may be geometric isomers or optical isomers.
Stereoisomers that are not mirror images of each other are called diastereomers. The compound (2R,3S)-2,3-dibromobutane is a meso compound because it contains two chiral centers but it is not optically active. The compound is internally compensated. The rotation of light by one chiral center is compensated by the other hence the compound is optically inactive.
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