Which of the following is a ketose?

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Multiple Choice

Which of the following is a ketose?

Explanation:
A ketose is a sugar that has a ketone group (carbonyl in the middle of the carbon chain) in its open-chain form. Fructose is a ketohexose, with the carbonyl at carbon 2, so it is a ketose. Glucose and galactose are aldohexoses, with an aldehyde group at carbon 1. Sucrose is a disaccharide made from glucose and fructose; it isn’t a ketose itself. That’s why fructose is the correct answer.

A ketose is a sugar that has a ketone group (carbonyl in the middle of the carbon chain) in its open-chain form. Fructose is a ketohexose, with the carbonyl at carbon 2, so it is a ketose. Glucose and galactose are aldohexoses, with an aldehyde group at carbon 1. Sucrose is a disaccharide made from glucose and fructose; it isn’t a ketose itself. That’s why fructose is the correct answer.

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