Question

The alkene that exhibits geometrical isomerism is
(a) propene 

(b) 2-methylpropene

(c) 2-butene 

(d) 2-methyl-2-butene

Answer 1

(c) : When two groups attached to a double bonded carbon atom are same, the compound does not exhibit geometrical isomerism. 

Compounds in which the two groups attached to a double bonded carbon are different, exhibit geometrical isomerism, thus, only 2-butene exhibits cis-trans isomerism.