The incorrect statement regarding the given structure is

(fructose open chain)

(1) can be oxidized to a dicarboxylic acid with water
(2) will coexist in equilibrium with 2 other cyclic structures

Question

The incorrect statement regarding the given structure is

(fructose open chain)

(1) can be oxidized to a dicarboxylic acid with  water
(2) will coexist in equilibrium with 2 other cyclic structures
(3) despite the presence of –CHO does not give Schiff's test
(4) has 4 asymmetric carbon atoms

Canvas Classes · Accepted Answer

Analysis of the structure (this is fructose — a ketohexose):

Fructose structure:

(1) Can be oxidized to a dicarboxylic acid with Br₂ water — CORRECT ✓
Fructose, being a reducing sugar, can be oxidized. Br₂ water oxidizes the terminal –CH₂OH groups to –COOH, giving a dicarboxylic acid.

(2) Coexists in equilibrium with 2 other cyclic structures — CORRECT ✓
In aqueous solution, fructose exists in equilibrium between the open-chain form and two cyclic hemiketal forms (-fructofuranose and -fructo

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