JEE Main Chemistry question

Which one of the following does not exhibit the phenomenon of mutarotation?

(A)(+) SucroseCorrect
(B)(+) Lactose
(C)(+) Maltose
(D)(-) Fructose

Answer: (A)

Solution

Mutarotation requires a free (hemiacetal) anomeric group that can open to the aldehyde/ketone form and re-close; sucrose has both its anomeric carbons (of glucose and fructose) tied up in the glycosidic bond,

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Question ID VK-151065