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

Question

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


a) CHCl=CHCl


b) CH2=CH-CHCl2


c) HClCFCl


d) CBrH=CH-CH2Cl


e) 1,1-dichloroethene

Answer 1

a) only has two carbons, so it won't make a difference which side of the double bond they are located on.

b) only has three carbons, so you can flip the molecule around

c) only has one carbon, so there is no double bond.

d) yes.

e) only two carbons.

Answer 2

a) Yes

b) No

c) No

d) Yes

e) Yes