The correct option (a) 2-butene
(c) 1- phenyl propene
Explanation:
CH3 - CH = H - CH3 shows the property of geometrical isomerism.

CH3 - CH = CH2 does not show the property of geometrical isomerism. CH3 - CH = CH - C6H5 shows the property of geometrical isomerism.

(CH3)2 - C = CH - CH3 does not show the property of geometrical isomerism.