Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Question Explanation: Identifying compounds that exhibit restricted rotation with different groups. Concept: Conditions for Geometrical Isomerism (GI).

Solution:

For a molecule to show Geometrical Isomerism, it must have restricted rotation (like a double bond or ring) and each atom involved in that restricted rotation must be attached to two different groups.

Option 1: Shows optical isomerism (atropisomerism) due to hindered rotation, but not GI.

Option 2: One end of the double bond has two identical Hydrogen atoms, so no GI.

Option 3: The exocyclic double bond has different groups (H and CH ) and the ring carbon is

chiral/asymmetric due to the methyl group, creating two different environments. This allows

for cis and trans arrangements

Option 4: Both terminal carbons have identical Hydrogen atoms, so no GI.