Q54 / 200 · NEET 2010 (Screening) · Chemistry

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

  • Correct answer
    A
    (+) Sucrose
  • B
    (+) Lactose
  • C
    (+) Maltose
  • D
    (-) Fructose

Solution

Key Idea:- Reducing sugars that exist in hemiacetal and hemiketal forms, undergo mutarotation in aqueous solution. Among the given carbohydrates, only sucrose is a non-reducing sugar as in it the hemiacetal and hemiketal groups of glucose and fructose are linked together through O-atom and thus, not free. Due to the absence of free hemiacetal or hemiketal group, sucrose does not exhibit mutarotation.

Hence, the correct answer is option: 'A'.

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