JEE Advanced levelSingle correct optionDifficulty 3 of 3bm181
A branched polysaccharide, built only from glucose residues joined by alpha-1,4 linkages with some alpha-1,6 branch points, has molar mass 16218gmol−1. Take each residue as CX6HX10OX5 (162) and the whole molecule as (number of residues x 162) + 18. The number of glycosidic bonds hydrolysed on complete conversion to glucose is
A100
B101
C99
D98
Answer: C
Residues n = (16218 - 18)/162 = 100. Joining n units (branched or linear) makes n - 1 glycosidic bonds, so 99 bonds and 99 water molecules are consumed.