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What kind of isomerism is exhibited by 2,3-dichlorobutane?

1. Structural isomerism
2. Geometrical isomerism
3. Optical isomerism
4. Diastereomerism

Correct answer: Optical isomerism

Solution

2,3-dichlorobutane has two stereocentres bearing identical groups, giving a pair of enantiomers plus a meso form, so it shows optical isomerism (option index 2).

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