Which of the following statement is not correct for Fructose ?

Options

A. Fructose is ketohexose
B. The cyclic five membered structure of fructose are
C. Fructose belongs to L - series
D. Fructose is laevorotatory compound

Answer

To determine which statement about fructose is not correct, let's analyze each of the given options step by step.

### Step 1: Understand the structure of fructose
Fructose is a simple sugar (monosaccharide) that is classified as a ketohexose. This means it has six carbon atoms and contains a ketone functional group.

### Step 2: Analyze the options
1. **Fructose is a ketohexose**: This statement is correct. Fructose has six carbon atoms and a ketone group, making it a ketohexose.

2. **The cyclic five-member structure of fructose are anomers**: This statement is also correct. When fructose cyclizes, it can form two different anomers (α and β forms) due to the different orientations of the hydroxyl group at the anomeric carbon.

3. **Fructose belongs to L-series**: This statement is **not correct**. Fructose is typically classified as a D-sugar, not an L-sugar. The L and D nomenclature is based on the configuration of the chiral carbon farthest from the carbonyl group, and fructose does not belong to the L-series.

4. **Fructose is a levorotatory compound**: This statement is correct. Fructose rotates plane-polarized light to the left, which means it is levorotatory.

### Conclusion
The statement that is not correct regarding fructose is: **"Fructose belongs to L-series."**

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