🤓 Based on our data, we think this question is relevant for Professor Arrey's class at Capital University.

What is the total strain energy (in kcal/mol) of the least stable (highest energy) conformation possible for 2-methylbutane? All of the choices below are expressed in units of kcal/mol.

A. 0 B. 0.9 C. 1.8 D. 2.7 E. 3.4

F. 4.4 G. 4.6 H. 5.8 I. 7.2 J. None of these

We’re being asked to **calculate the total strain energy (in kcal/mol)** for the least stable conformation of 2-methylbutane.

Recall that ** strain energy** is the energy a compound needs to overcome to change from one conformation to the other. It is the sum of the steric interactions present in a Newman projection.

For this problem, we need to do the following steps:

*Step 1:* Draw the Newman projection for the given structure.

*Step 2:* Identify the steric interactions and calculate the total strain energy.

Barrier To Rotation

Barrier To Rotation

Barrier To Rotation

Barrier To Rotation