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The freshly prepared solution if sugar u...

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

A

Inversion

B

Specific rotation

C

Rotatory motion

D

Mutarotation

Text Solution

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The correct Answer is:
To solve the question, we need to understand the concepts related to the optical rotation of sugar solutions. Here’s a step-by-step breakdown: ### Step 1: Understand Optical Rotation Optical rotation refers to the rotation of plane-polarized light as it passes through a solution of chiral compounds, such as sugars. Different sugars can rotate light in different directions and by different amounts. **Hint:** Optical rotation is a property of chiral substances that can be measured using a polarimeter. ### Step 2: Freshly Prepared Sugar Solution When a sugar solution is freshly prepared, it may have a specific optical rotation. However, over time, this optical rotation can change due to various chemical processes. **Hint:** Freshly prepared solutions can exhibit changes in properties due to chemical reactions or equilibria. ### Step 3: Identify the Process The change in optical rotation over time in a sugar solution is primarily due to the interconversion between different anomeric forms of the sugar. This process is known as mutarotation. **Hint:** Mutarotation specifically refers to the change in the optical rotation of a sugar solution as it equilibrates between different anomeric forms. ### Step 4: Define Mutarotation Mutarotation is the phenomenon where the optical rotation of a sugar solution changes due to the conversion between its alpha (α) and beta (β) anomers. This occurs until an equilibrium is reached. **Hint:** Remember that mutarotation involves the conversion of cyclic forms of sugars, which can interconvert through an open-chain form. ### Step 5: Conclusion Based on the understanding of optical rotation and the process involved, the answer to the question is that the freshly prepared solution of sugar undergoing a change in optical rotation with time is known as **mutarotation**. **Final Answer:** Mutarotation (Option B)
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