Question

For each of the following structures, draw the most stable chair conformer.

Short answer

We have to draw the most stable chair conformer:

a)

b)

Step-by-step solution

What is axial position and equatorial position

Axial position= In cycloheaxane a bond which is parallel to the axis of the ring is called its axial position.

Equatorial position= In cycloheaxane a bond which is perpendicular to the axis of the ring is called its equatorial position.

How to give priority 

The groups with the highest priority will placed on the equatorial positions and rest of the substituents will placed on the axial positions.

1. Assign the priority order to the groups on the basis of atomic number. Higher the atomic number get highest priority.
2. Double bond is considered as carbon is attached to 2 carbons.
3. Triple bond is considered as carbon is attached to 3 carbons.