Question

Which of the following compounds exhibit cis-trans isomerism? A) CH2=CH2 B) CH2=CCl2 C) CBr2=CHBr D) CHCl=CHCl E) (CH3)2C=CH-CH2CH3?

Answer 1

 D) CHCl=CHCl , it is the only one that exhibit cis-trans isomerism

Answer 2

The only compound that exhibits cis-trans isomerism is;

Option B; CH₂ = CCl₂

Cis-trans Isomerism is a geometric isomerism that occurs when the substituents attached to each doubly bonded carbon atom are different.

Let us look at the options;

A) CH₂ = CH₂; This will not exhibit cis-trans isomerism because the substituents attached to each doubly bonded carbon atom are the same H₂.

B) CH₂ = CCl₂; This will exhibit cis-trans isomerism because the substituents attached to each doubly bonded carbon atom are H₂ and Cl₂ which are different.

C) CBr₂ = CHBr; This will not exhibit cis-trans isomerism because the substituents attached to each doubly bonded carbon atom are the same functional group Br.

D) CHCl = CHCl; This will not exhibit cis-trans isomerism because the substituents attached to each doubly bonded carbon atom are the same functional group Cl.

E) (CH₃)₂C = CH-CH₂CH₃; This will not exhibit cis-trans isomerism because the substituents attached to each doubly bonded carbon atom are the same functional group CH₃.

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