Double bonds do not rotate freely under normal conditions. The change from Z to E requir...

Double bonds do not rotate freely under normal conditions. The change from Z to E requires a reaction. This can occur in the presence of a catalyst or with the addition of a large amount of energy (e.g., at high temperature).

One such reaction is diagramed below:

(1) Add enough potential energy to break the double bond (Eact),

(2) free rotation occurs at high energy transition state, then

(3) reforming the double bond as a mixture of Z and E.

Draw E-2-butene in one box and Z-2-butene in the other box, and explain your reasoning