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Which of the following alkenes shows optical isomerism?

1. 3-methyl-2-pentene
2. 4-methyl-1-pentene
3. 3-methyl-1-pentene
4. 2-methyl-2-pentene

Correct answer: 3-methyl-1-pentene

Solution

3-methyl-1-pentene has a double bond between the first and second carbon atoms, which creates a chiral center when the substituents on the double bond are different, allowing for the existence of optical isomers. In contrast, the other options do not possess the necessary chiral centers to exhibit optical isomerism.

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