The commonest disaccharide has the molecular formula?

Options

A. `C_(10)H_(8)O_(9)`
B. `C_(12)H_(24)O_(12)`
C. `C_(18)H_(22)O_(12)`
D. `C_(12)H_(22)O_(11)`

Answer

To determine the molecular formula of the commonest disaccharide, follow these steps:

1. **Identify the Commonest Disaccharide**: The most common disaccharide is sucrose. This is a key piece of information as it leads us to the next step.

2. **Find the Molecular Formula of Sucrose**: The molecular formula for sucrose is C12H22O11. This means that sucrose consists of 12 carbon (C) atoms, 22 hydrogen (H) atoms, and 11 oxygen (O) atoms.

3. **Confirm the Molecular Formula**: To ensure that we have the correct molecular formula, we can cross-reference it with known data about sucrose. This confirms that the molecular formula C12H22O11 is accurate.

4. **Check the Options Provided**: If there are multiple-choice options given, we need to compare the known molecular formula of sucrose (C12H22O11) with the options provided.

5. **Select the Correct Option**: After comparing, we find that the option that matches the molecular formula of sucrose is C12H22O11, which is the correct answer.

Thus, the molecular formula of the commonest disaccharide, sucrose, is C12H22O11.