Which of the following is an aldose?

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Multiple Choice

Which of the following is an aldose?

Explanation:
An aldose has an aldehyde group in its open-chain form. Glucose is an aldohexose, with the aldehyde group at carbon 1 when drawn in the straight-chain form, so it fits the aldose type. Fructose, on the other hand, is a ketose (a ketohexose) with a ketone group at carbon 2. Sucrose and maltose are disaccharides; they’re not defined by a single aldehyde or ketone group themselves, though they contain glucose units. The defining feature here is that glucose carries the aldehyde, making it the aldose.

An aldose has an aldehyde group in its open-chain form. Glucose is an aldohexose, with the aldehyde group at carbon 1 when drawn in the straight-chain form, so it fits the aldose type. Fructose, on the other hand, is a ketose (a ketohexose) with a ketone group at carbon 2. Sucrose and maltose are disaccharides; they’re not defined by a single aldehyde or ketone group themselves, though they contain glucose units. The defining feature here is that glucose carries the aldehyde, making it the aldose.

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