Question

Draw the staggered and eclipsed conformations that result from rotation around the C-C bond in${\mathrm{CH}}_3-{\mathrm{CH}}_2\mathrm{Br}$.

Short answer

The staggered and eclipsed conformations are shown below:

Step-by-step solution

Step 1. Newman projection

In the Newman projection, the dot represents the front carbon, whereas the circle represents the back carbon.

Step 2. Staggered conformation

In the staggered conformation, the dihedral angle between the atom of front carbon and the atom of back carbon is ${60}^{\mathrm{o}}$. The staggered conformation is shown below:

Staggered conformation

Step 3. Eclipsed conformation

In the eclipsed conformation, the dihedral angle between the atom of front carbon and the atom of back carbon is $0^{\mathrm{o}}$. The eclipsed conformation is shown below:

Eclipsed conformation