Which aldohexose gives an optically inactive (meso) aldaric acid on oxidation with hot dilute nitric acid?

AD-mannose
BD-fructose
CD-glucose
DD-galactose

Answer: D

The aldaric acid from galactose has a mirror plane because the C-2/C-5 and C-3/C-4 pairs are mirror images. Glucose and mannose give optically active aldaric acids, and fructose is cleaved rather than giving an aldaric acid.

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