Chemistry - STEREO ISOMERISM Question with Solution | TestHub

The given compound is 1,3-diphenylcyclobutane-2,4-dicarboxylic acid, which is commonly known as truxillic acid.

It features a cyclobutane ring with two identical phenyl ($-Ph$) groups at alternate positions (1, 3) and two identical carboxylic acid ($-COOH$) groups at alternate positions (2, 4).

The arrangement of these substituents relative to the upper and lower faces of the cyclobutane ring gives rise to different cis/trans geometrical configurations.

Consequently, there are exactly 5 geometrical isomers possible for this compound: $\alpha$-, $\gamma$-, $ϵ$-, peri-, and epi-truxillic acid.

All five of these isomers are achiral (meso-like) due to internal elements of symmetry, such as planes of symmetry or a center of inversion.