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What term is used for substances that lack optical activity even though they contain chiral centers?

1. Compounds that lack optical activity despite having chiral centers are referred to as meso-compounds.
2. Compounds that exhibit optical activity due to the presence of chiral centers are referred to as meso-compounds.
3. Compounds that exhibit optical activity because they lack chiral centers are referred to as meso-compounds.
4. Compounds that lack optical activity because they do not contain chiral centers are referred to as meso-compounds.

Correct answer: Compounds that lack optical activity despite having chiral centers are referred to as meso-compounds.

Solution

Meso-compounds are optically inactive despite having chiral carbon atoms because they possess an internal plane of symmetry, which cancels out optical activity.

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