First slide

Disaccharides

Question

Statement 1: Sucrose is a non-reducing sugar.
Statement 2: It has glycosidic linkage.

Moderate

A

Both statements 1 and 2 are correct
B

Statements 1 is correct and statement 2 is incorrect
C

Statement 1 is incorrect and statement 2 is correct
D

Both statements 1 and 2 are incorrect

Solution

Sucrose is a non-reducing sugar as it does not reduce Tollen's or Fehling's reagent, due to absence of free aldehyde or ketone group. It contains stable acetal or ketal structure
which cannot be opened into a free carboxyl group. sugar is composed of $α$ -D-glucopyranose unit and $β$ -D-fructofuranose unit. These units are joined by $β$ -glycosidic linkage between C-1 of the glucose unit and C-2 of the fructose unit.

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