Which of the following statements is not true about surcose ?

Options

A. It is a non reducing sugar
The glycosidic linkage is present
B. Between `C_(1)` so `alpha`-glucose and `C_(1)` of `beta`-fructose
C. It is also named as invert sugar
D. On hydrolysis, it produces glucose and fructose

Answer

To determine which statement is not true about sucrose, let's analyze the given options step by step.

### Step 1: Identify the nature of sucrose
Sucrose is a disaccharide composed of two monosaccharides: glucose and fructose. It is important to note that sucrose does not have a free aldehyde or ketone group, which makes it a non-reducing sugar.

### Step 2: Evaluate each statement
- **Option A**: "Sucrose is a non-reducing sugar."
- This statement is **true**. Sucrose does not reduce Fehling's solution or Tollens' reagent because it does not have a free aldehyde or ketone group.

- **Option B**: "The glycosidic linkage is present between the C1 of alpha glucose and C1 of beta-D-fructose."
- This statement is **not true**. The glycosidic linkage in sucrose is actually between the C1 of alpha-D-glucose and the C2 of beta-D-fructose, not between C1 of both sugars.

- **Option C**: "Upon hydrolysis, sucrose yields glucose and fructose."
- This statement is **true**. When sucrose is hydrolyzed, it breaks down into one molecule of glucose and one molecule of fructose.

- **Option D**: "Sucrose is dextrorotatory, and its hydrolysis results in an invert sugar."
- This statement is **true**. Sucrose is dextrorotatory (it rotates plane-polarized light to the right), and upon hydrolysis, it produces a mixture that is levorotatory (it rotates plane-polarized light to the left), hence termed invert sugar.

### Conclusion
Based on the evaluation, the statement that is **not true** about sucrose is **Option B**: "The glycosidic linkage is present between the C1 of alpha glucose and C1 of beta-D-fructose."

### Final Answer
**Option B** is the statement that is not true about sucrose.

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