Question

Which of the following compounds does not show geometrical isomerism?

• A. 2-butene
• B. 2-pentene
• C. 2-methyl propene
• D. 2-3-dibromo-2-butene

Answer 1

The correct option is C

2-methyl propene

The explanation for the correct option:

(C) 2-methyl propene

Geometrical isomerism:

• Geometrical isomerism is exhibited by alkenes that contain two different groups on each double-bonded carbon atom.
• 2-methyl propene contains identical groups on both the double-bonded carbon atoms, hence it does not show geometrical isomerism.

Explanation for incorrect options

(A) 2-butene

2-butene can show geometrical isomerism due to the different groups on each double-bonded carbon atom.

(B) 2-pentene

2-pentene can show geometrical isomerism due to the different groups on each double-bonded carbon atom.

(D) 2-3-dibromo-2-butene

2-3-dibromo-2-butene can show geometrical isomerism due to the different groups on each double-bonded carbon atom.

Hence, the correct option is (C) i.e. 2-methyl propene does not show geometrical isomers.