Enumerate the reactions of `D`-Glucose which cannot be explained by its open-chain structure.

Answer

Limitations of the-chain structure
(i) `D(+)` glucose does not undergo certainreactions of aldehydes For example glucose does not from `,4 -DNP` derivative and does not respond to Schiff's reagent test
(ii) Glucose reacts with `NH_(2)OH` to from an oxime glucose penta-acetate does not
(iii) Glucose does not from the hydrogensulphite addiition product with `NaHSO_(3)`
(iv) The process of mutarotation in glucose .

Explanation

Lactose is found in milk so also called as milk sugar.