First member of ketose sugar is:

Ketotriose

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Ketotetrose

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Ketopentose

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Ketohexose

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Solution

The correct option is B Ketotriose
A ketose is a monosaccharide containing one ketone group per molecule. The simplest ketose is dihydroxyacetone, which has only three carbon atoms, and it is the only one with no optical activity.

Thus, the first member of ketose sugar is Ketotriose. It is also called 1,3-dihydroxypropan-2-one.

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