Which of the following statement about the pyranose form of mannose is not correct?

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It reacts with Tollens’ reagent to give a silver mirror. (i.e., it is a reducing sugars).

Reaction with excess CH₃I and AgOH gives a non-reducing penta–O–methyl derivative.

It resist reduction with aqueous sodium borohydride

It exists as two anomeric stereoisomers.

answer is D.

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Detailed Solution

Monosaccharides

mannose exists as two anomeric stereoisomers
mannose reacts with Tollens’ reagent to give a silver mirror. (i.e., it is a reducing sugars).
Reaction with excess CH₃I and AgOH gives a non-reducing Penta–O–methyl derivative.
mannose reduction with aqueous sodium borohydride

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