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What is the product formed when glucose is reduced using sodium borohydride (NaBH4)?

1. Sorbitol
2. Fructose
3. Glycerol
4. None of these

Correct answer: Sorbitol

Solution

Glucose (an aldehyde sugar, C6H12O6) is reduced by NaBH4 at the aldehyde (-CHO) group to give sorbitol (glucitol, C6H14O6), a hexahydric alcohol (polyol). This is a standard reaction of aldoses.

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