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Answer 1 · 2016-09-07T14:09:33

There are four stereoisomers of 1-bromo-2-chlorocyclobutane.

The structure of 1-bromo-2-chlorocyclobutane is

1Br2Cl

$"C1"$ and $"C2"$ are chiral centres, so the maximum number of stereoisomers is $2^2 = 4$ .

We use wedges and dashes to represent stereoisomers.

The possible combinations are wedge-wedge, dash-dash, wedge-dash, and dash-wedge.

The corresponding structures are

4 Structures

There are no internal planes of symmetry, so every structure is a different stereoisomer.