Which of the following carbohydrate will not give positive Molisch’s Test?

Maltose

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Starch

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Erythrose

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Sucrose

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Solution

The correct option is C Erythrose
This is a common test for all carbohydrates larger than tetroses.
Carbohydrates undergo dehydration when heated with concentrated $H_{2} S O_{4}$ to form furfural derivatives. Furfural derivatives so obtained are condensed with $α -$ naphthol to give coloured compounds.

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