For which double bonds are stereoisomers possible?

a.

b.

c.

Stereoisomers isomers are those kinds of isomers where the molecular formula and structures remain the same, and the spatial arrangement of atoms is different.

Cis/Z and trans/E are the two kinds of stereoisomers. Stereoisomer is possible in those structures where different substituents are present across the double-bonded carbons.

The double-bonded carbons are identified first and are marked as blue.

Representation of double bonds in the structures

a.

Compound a

A stereoisomer is not possible here since two similar alkyl groups are attached to the same carbon.

b.

Compound b

Stereoisomer is possible here since different alkyl groups are present in the double-bonded carbon. The alkene here is considered to be trans/E.

c.

Compound c

Similar to b, here, stereoisomer is possible because different alkyl groups are present in the double-bonded carbon. The alkene here is considered to be trans/E.

Thus, the stereoisomers possible for double bonds are present in compounds b and c.