Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Question Explanation:

Identify which chair conformations represent trans-dichlorocyclohexane.

Concept:

This is based on chair conformations (axial and equatorial bonds) and geometrical isomerism. Solution:

In a disubstituted cyclohexane, trans means one group is "up" and the other is "down" relative to the ring plane.

For 1,2-positions, trans corresponds to axial-axial (a,a) or equatorial-equatorial (e,e). Structure (ii) shows an (e,e) arrangement, which is the trans form. Other three structures show cis form (both Cl atoms are on the same side).

Final Answer: Option (B)