Discussion
Name the water soluble non-B complex vitamin that is structurally similar to a monosaccharide :
Answer: D
The vitamin is Ascorbic acid (vitamin C).
Ascorbic acid is a six-carbon lactone, a sugar acid closely related to glucose: plants and most animals make it from glucose via glucuronate and gulonolactone. Humans lack the last enzyme, L-gulonolactone oxidase, so they need it in the diet. It is water soluble and is not part of the B complex.
Pantothenic acid (B5), biotin (B7) and niacin (B3) are all members of the B complex, so they are excluded by the question's 'non-B complex'. None of them resembles a monosaccharide: pantothenic acid is an amide of pantoic acid and beta-alanine, biotin a fused ring with sulphur, and niacin a pyridine carboxylic acid.
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