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Which statement correctly describes a common feature shared by optical and geometrical isomerism?

1. For any given compound, both always produce the same number of isomers.
2. Whenever one of these isomerisms occurs in a compound, the other must also be present.
3. Both of these types are classified under stereoisomerism.
4. They do not share any common feature.

Correct answer: Both of these types are classified under stereoisomerism.

Solution

Optical and geometrical isomerism are both subclasses of stereoisomerism - that is their shared feature. One does not require the presence of the other, so the stored statement is wrong.

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