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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 . Take each residue as () and the whole molecule as (number of residues x 162) + 18. The number of glycosidic bonds hydrolysed on complete conversion to glucose is

  1. A100
  2. B101
  3. C99
  4. 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.
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