Classify the following into monosaccharides and disaccharides: Ribose, `2-`deoxyribose, maltose,galactose, fructose,and lactose.

Explanation

To classify the given compounds into monosaccharides and disaccharides, we need to understand the definitions of each type of sugar.

### Step-by-Step Solution:

1. **Define Monosaccharides**:
- Monosaccharides are the simplest form of carbohydrates. They consist of a single sugar molecule and cannot be hydrolyzed into simpler sugars. Examples include glucose, fructose, and galactose.

2. **Identify Monosaccharides from the List**:
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