LA blue liquid was added to an aldehyde solution. The blue color disappeared and a red precipitate formed. This reaction is characteristic of Benedict's reagent hemiacetal formation alcohol addition O Tollen's reagent
LA blue liquid was added to an aldehyde solution. The blue color disappeared and a red precipitate formed. This reaction is characteristic of Benedict's reagent hemiacetal formation alcohol addition O Tollen's reagent
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Aldehyde Reaction Identification**
**Question:**
A blue liquid was added to an aldehyde solution. The blue color disappeared and a red precipitate formed. This reaction is characteristic of:
1. Benedict's reagent (Correct - Selected)
2. Hemiacetal formation
3. Alcohol addition
4. Tollen's reagent
**Explanation:**
This is a characteristic reaction of Benedict's reagent when it reacts with an aldehyde. The initial blue color, which is due to the presence of copper(II) ions, disappears as the copper ions are reduced to cuprous oxide (red precipitate) upon reacting with an aldehyde. This indicates a positive test for the presence of reducing sugars, which can reduce copper(II) ions to copper(I).
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