Question

Question: Considering rotation around the bond highlighted in pink in each compound, draw Newman projections for the most stable and least stable conformations.

a.

b.

Short answer

Answer

a.

b.

Step-by-step solution

Conformation

The conformation is the molecule's structure, which is obtained by the rotation of the single bond in the molecules.

Eclipsed conformation

The eclipsed conformation is obtained when the two substituents on the two corresponding carbon atoms have zero-degree angles or overlap.

The eclipsed conformation is always higher in energy compared to the staggered conformation.

Staggered conformation

The staggered conformation is obtained when the two substituents on the two corresponding carbon atoms have a${60}^0$ angle.

Explanation

a.

The Newman projection of the given molecule is shown as:

Newman projection

b.

The Newman projection of the given molecule is shown as:

Newman projection