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I have just learned esterification of normal reactions with aliphatic compounds, but this one is a cyclic compound. Is it different? There are both a hydroxyl group and a carboxyl group in choice B and D, but why the correct answer is B, not D?

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The correct answer is glycolic acid, B.

It forms the cyclic di-ester glycolide (1,4-dioxane-2,5-dione).

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