Which alkene listed below can have both cis and trans isomers?
I. 1-pentene
II. 2-pentene
III. 2-methyl-2-pentene

Question

Quizplus · Accepted Answer

II. 2-pentene can have both cis and trans isomers because it has different substituents on both ends of the double bond, allowing for geometric isomerism. 1-pentene and 2-methyl-2-pentene cannot exhibit cis-trans isomerism because 1-pentene has the double bond at the end of the chain and 2-methyl-2-pentene has the double bond in a position where the same groups are on the same side of the double bond, preventing the formation of different isomers based on the positioning of substituents.

Which Alkene Listed Below Can Have Both Cis and Trans