A) it is chemically stable
B)
it contains no free aldehyde or keto group adjacent to a 
group
C) it is built up of a fructose unit
D) it is optically active
Correct Answer: B
Solution :
: All those carbohydrates which contain aldehydic or ketonic group in the hemiacetal or hemiketal form and reduce Tollens or Fehlings reagent are called reducing sugars. Disaccharides like sucrose in which the two monosaccharide units are linked through their reducing centres, i.e., aldehydic or ketonic groups are non-reducing.
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