Which of the following compounds can exist as cis and trans isomers ?

Question

a) CHCl=CHCl


b) CH2=CH-CHCl2


c) ClBrCHCl


d) (CH3)2C=CH-CH3


e) 1,1-dichloroethene

Answer 1

Only A can have cis-trans isomerism. Make models of the compounds and check out WHY the others cannot.