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Question:

Which of the following compounds will exhibit geometrical isomerism?

3-phenyl-1-butene

2-phenyl-1-butene

1,1-diphenyl-1-propane

1-phenyl-2-butene

Solution:

1-phenyl-2-butene shows geometrical isomerism in the form of cis and trans isomers. However, the geometrical isomerism is not possible for 3-phenyl-1-butene, 2-phenyl-1-butene and 1,1-diphenyl-1-propane.