Question

Select the pair of compounds which exhibit cis-trans (geometrical) isomerism:

• A. succine acid and maleic acid
• B. funaric acid and maleic acid
  
• C. lactic acid and tartaric acid
• D. acetic acid and crotonic acid

Answer 1

The correct option is B funaric acid and maleic acid

Geometric isomers are two or more compounds with the same number and types of atoms, and bonds, but which have different geometries for the atoms.

$\text{Maleic acid is the cis isomer of butenedioic acid, whereas fumaric acid is the trans isomer.}$