JEE Main Chemistry question

[DCE 2007] Which of the following indicates the open chain structure of glucose?

(A)Pentaacetyl derivative of glucoseCorrect
(B)Cyanohydrin formation with HCN
(C)Reaction with Fehling solution
(D)Reaction with Tollens' reagent

Answer: (A)

Solution

Treating glucose with excess acetic anhydride gives a pentaacetate in which all five –OH groups (four secondary and one primary) are esterified while a free aldehydic carbon remains, which is only possible if glucose has an open-chain structure with five hydroxyls plus one separate –CHO group. Cyanohydrin formation,

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-150585