Which of the following tests does glucose give?(a) Tollen’s test(b) 2,4-DNP test(c) Schiff’s test(d) Addition product with NaHSO3The question was asked by my college professor while I was bunking the class.This intriguing question originated from Biomolecules Carbohydrates topic in section Biomolecules of Chemistry – Class 12

Which of the following tests does glucose give?(a) Tollen’s test(b)

1.	Which of the following tests does glucose give?(a) Tollen’s test(b) 2,4-DNP test(c) Schiff’s test(d) Addition product with NaHSO3The question was asked by my college professor while I was bunking the class.This intriguing question originated from Biomolecules Carbohydrates topic in section Biomolecules of Chemistry – Class 12
Answer» Right answer is (a) Tollen’s test Explanation: Despite having a CHO group, GLUCOSE does not react with NAHSO3 to form an addition product and GIVE EITHER Schiff’s test or 2,4-DNP test like other aldehydes. However, it forms a silver mirror on treatment with Tollen’s reagent. These observations INDICATE the existence of glucose in other forms and gave way to the cyclic structure of glucose.

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