Does the structure below exhibit geometric isomerism? ch3 tally1 ch3 - c - ch═ch-ch3 tally1 ch3

YES! The given compound exhibit Geometrical Isomerism.

Explanation:

In Geometrical Isomerism orCis-Trans Isomerism, isomers possess same molecular formula, same structural formula with a double bond and with a only difference in the arrangement of atoms or group of atoms about the double bond in three dimensional space.

4,4-dimethylpent-2-ene (given problem) has two groups about the double bond i. e. Methyl (CH₃-) and tertiary Butyl [ (CH₃) ₃-C-]. In cis configuration both groups are at same side of the double bond, while in trans configuration both groups are located opposite to each other as shown below,