With which of the following reagents glucose does not react?
(correct answer +1, wrong answer -0.25)

H I

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N a H S O_{3}

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B r_{2}, H_{2} O

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A c_{2} O

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Solution

The correct option is B $N a H S O_{3}$
Simple aldehyde reacts with sodium bisulphite and this helps in detection, seperation and classification of aldehydes.
However, $C H O$ group in glucose is not free but it is involved in hemiacetal formation with $C - 5$ . Hence, it does not show reaction with $N a H S O_{3}$ . Also steric crowding in glucose inhibit the reaction to happen.

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