JEE Main Chemistry question

[BITSAT 2008, AMU 2008, EAMCET 2008] Hydrolysis of sucrose with dilute aqueous sulphuric acid yields

(A)1 : 1 D-(+)-glucose; D-(-)-fructoseCorrect
(B)1 : 1 D-(+)-glucose; D-(-)-mannose
(C)1 : 1 D-(-)-glucose; D-(+)-fructose
(D)1 : 1 D-(-)-glucose ; D-(+)-fructose

Answer: (A)

Solution

Acid hydrolysis of sucrose cleaves the glycosidic bond to release one mole each of D-(+)-glucose and D-(−)-fructose in a 1:1 ratio, with the natural dextrorotatory D-glucose and natural laevorotatory D-fructose (this inversion of net rotation from dextro to laevo is why the product mixture is

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Question ID VK-150630