The change in optical rotation with time of freshly prepared solutions of sugar is known as:

specific rotation

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inversion

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rotatory motion

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muta-rotation

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Solution

The correct option is D muta-rotation
Mutarotation can be called the change in the optical rotation at equilibrium between two anomers, when the corresponding stereocenters interconvert. Cyclic sugars show mutarotation as $α$ and $β$ anomeric forms interconvert.

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The change in optical rotation, with time, of freshly prepared solution of sugar is known as

[CPMT 1982, 85; BHU 1997]

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