Question

Which of the following does not exhibit cis-trans isomerism?
(a) C₆H₅CH = NOH (b) C₆H₅N = NC₆H₅
(d) None of the three

Answer 1

I think the answer is (b) C6H5N=NC6H5

Answer 2

Following that does not exhibit cis-trans isomerism is :

(a) C₆H₅CH = NOH

• It exhibit cis-trans isomerism as carbon atom have two different group attached to it i.e -H and -C₆H₅. Also nitrogen have different groups i.e -OH and one lone pair.

(b) C₆H₅N = NC₆H₅

• This compound also exhibit cis-trans isomerism as both nitrogen atom have different group attached to them i.e C₆H₅ and one lone pair.

• We have only two compounds. And both of them exhibit geometrical isomerism.