JEE Main 2017 · 9 Apr · Shift 1 · Chemistry Q53

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ChemistrySingle correct+4 / -1Question 53 of 90

In the following structure, the double bonds are marked as I, II, III and IV

Geometrical isomerism is not possible at site (s) :

Skeletal formula of a branched tetraene. Double bond I is at a chain end bearing two methyl groups on one carbon (an isopropylidene end); II is a trisubstituted double bond in the chain; III and IV are conjugated double bonds, each carbon bearing two different groups.

III

I and III

III and IV

Answer and worked solution

Official answer: B

Site I has two identical methyl groups on one carbon (an isopropylidene end), so it cannot show cis-trans isomerism. Sites II, III and IV have two different groups on each carbon.

Topics:Geometrical isomerism

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JEE Main 2017 · 9 Apr · Shift 1, Chemistry question 53