Question

Which of the following is not an aldohexose ?
a) glucose b) gulose c) manose d) arabinose​

Answer 1

Explanation:

C} option : manose

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Answer 2

Arabinose is not aldohexose.

• All the sugars mentioned - glucose, gulose, and mannose are aldohexose sugars.
• Aldohexose sugars are those which are six- carbon containing compounds, with an aldehyde group as their functional reactive group at first carbon, called the anomeric carbon ( in open-chain structure)
• While arabinose is an aldopentose as in its structure 5 carbons are present with an aldehyde as a functional group.
• Gulose and mannose are epimers of glucose at positions C-2 and C-3 respectively.
• Epimers are those compounds that have a similar structure but differ in the position of the -OH group at a single carbon.