The general molecular formula for disaccharide is:
A) C12H22O11

B) C10H20O10

C) C12H20O10

D) C12H22O10

To determine the general molecular formula for a disaccharide, let's break down the question.

Disaccharides are carbohydrates composed of two monosaccharide units linked together by a glycosidic bond. Monosaccharides, which are the simplest form of carbohydrates, generally have the formula \( C_nH_{2n}O_n \).

For instance, the simplest monosaccharide glucose has the formula \( C_6H_{12}O_6 \).

When two monosaccharides combine to form a disaccharide, a dehydration reaction occurs, which results in the loss of one water molecule (\( H_2O \)) from the two monosaccharide units.

The general formula for a disaccharide can be derived by combining two monosaccharides and subtracting the water molecule:
\[ C_nH_{2n}O_n + C_nH_{2n}O_n - H_2O \]
\[ = C_{2n}H_{4n}O_{2n} - H_2O \]
\[ = C_{2n}H_{2n-2}O_{2n-1} \]

For most common disaccharides like sucrose, lactose, or maltose, the formula \( C_{12}H_{22}O_{11} \) is observed.

So the correct answer is:
**A) C12H22O11**