Read the following statements and choose the correct answer?
(i) All monosaccharides are reducing sugars.
(ii) All monosaccharides are not reducing sugars.
(iii) In disaccharides if aldehydic or ketonic or both aldehydic, ketonic groups are involved in glycosidic bond, these are non-reducing sugars.
(iv) In disaccharides if aldehydic or ketonic groups are free, these are reducing sugars.

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(i), (iii) and (iv)

(ii), (iii) and (iv)

(ii) and (iv)

(i) and (iv)

answer is A.

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Detailed Solution

All monosaccharides are reducing sugars because all monosaccharides have an aldehyde group (if they are aldoses) or can tautomerize in solution to form an aldehyde group (if they are ketoses).

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