Question

a.Which of the following compounds can exist as cis-trans isomers?

b. For those compounds that can exist as cis and trans isomers, draw and label the isomers.

1 CH₃CH = CHCH₂CH₂CH₃

2 CH₃CH₂ C = CHCH₃

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CH₂CH₃

3.CH₃CH = CHCH₃

4. CH₃CH₂CH=CH₂

Short answer

a) Option 1 and 3 will exist as cis-trans isomers.

b)

Step-by-step solution

Definition of isomer         

Isomers are those which have the same atoms in space but the linkage and their spatial orientations are different.

Subpart (a) The probable isomers for cis-trans orientation

Those molecules will be in the cis-trans position which has different groups around double bonds. Except for options 2 and 4, all the molecules have different groups around the alkene bond, so numbers 1 and 3 will be in cis-trans isomerism

Subpart (b)Graphical representation of cis-trans isomerism

Option 1 and 3 will exist as cis-trans isomers because they have different groups around the double bond. The pictorial representation of cis-trans isomers is given below,