Cyclic hemiacetals are more common than open-chain acetals.

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Cyclic hemiacetals are formed when a hydroxyl group on a molecule reacts with an aldehyde or ketone group on the same molecule to form a ring structure. This type of reaction is common in carbohydrates, which often exist in cyclic hemiacetal forms. Open-chain acetals, on the other hand, require the presence of an alcohol group on a second molecule to form a bond and are less commonly found in nature.

Cyclic Hemiacetals Are More Common Than Open-Chain Acetals