For which of the following can exhibit cis-trans isomerism possible?
I. 1,4-dichlorobenzene
II. 2,4-dichloro-2-butene
III. 1,1-dichloro-1-butene

Question

Quizplus · Accepted Answer

Cis-trans isomerism is possible in 2,4-dichloro-2-butene (II) because it has a double bond with different groups attached to each carbon of the double bond. 1,4-dichlorobenzene (I) is symmetrical and does not have a double bond, and 1,1-dichloro-1-butene (III) has identical groups on one of the carbons of the double bond, preventing cis-trans isomerism.

For Which of the Following Can Exhibit Cis-Trans Isomerism Possible