Which is false

Options

A. glucose is a disaccharide
B. starch is a polysaccharide
C. Glucose and fructose are not anomers
D. Invert sugar consists of glucose and fructose

Explanation

To determine which statement is false, we will analyze each option provided in the question.

### Step 1: Analyze the first statement
The first statement claims that "glucose is a disaccharide."

- **Explanation**: A disaccharide is a carbohydrate composed of two monosaccharide units. Glucose, however, is a monosaccharide, which means it is a single sugar unit. Therefore, this statement is false.

### Step 2: Analyze the second statement
The second statement claims that "glucose and fructose are anomers."

- **Explanation**: Anomers are a type of stereoisomer that differ in configuration at the anomeric carbon (the carbon derived from the carbonyl carbon during the formation of a cyclic structure). Glucose and fructose are not anomers; they are different types of monosaccharides. Therefore, this statement is also false.

### Step 3: Analyze the third statement
The third statement claims that "anomers may not exist."

- **Explanation**: This statement is misleading. Anomers do exist; they are specific types of isomers that occur in cyclic sugars. Therefore, this statement is false.

### Step 4: Analyze the fourth statement
The fourth statement claims that "invert sugar consists of glucose and fructose."

- **Explanation**: Invert sugar is a mixture of glucose and fructose that results from the hydrolysis of sucrose. This statement is true.

### Conclusion
After analyzing all the statements, we find that the first, second, and third statements are false. However, the question asks for which is false, and the first statement is the most straightforwardly incorrect.

### Final Answer
The false statement is: "Glucose is a disaccharide."

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