The alkene that exhibits geometrical isomerism is: Propene, 2-Methyl propene, 2-Butene, 2-Methyl-2-butene

2-butene exists as cis or trans. Due to restricted rotation around the double bond, it exhibits geometric isomerism. In other options, one carbon of (C=C) has the same groups, so it does not show geometrical isomerism. Option D is correct.