The functional group (s) in reducing sugar that tests positive with Tollen's reagent is (are) · ABC26OR0829
Subject: Organic Chemistry · Chapter: Natural Products · Topic: Natural Products & – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium
The functional group (s) in reducing sugar that tests positive with Tollen's reagent is (are)
(a)Aldehyde
(b)Ketone
(c)Acetal
(d)Hemi-acetal
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.
Explanation
Answer: (a) aldehyde and (d) hemiacetal — Reducing sugars exist as cyclic hemiacetals in equilibrium with the open-chain aldehyde, which Tollens' reagent oxidises. Full acetals (glycosides) do not open and are non-reducing.