A nucleoside on hydrolysis gives

Options

A. an aldopentose and a nitrogenous base
B. an aldopentose and phosphoric acid
C. an aldopentose, a nitrogenous base and phosphoric and
D. a nitrogenous base and phosphoric acid

Explanation

To solve the question "A nucleoside on hydrolysis gives," we need to understand the structure of a nucleoside and what happens during hydrolysis.

### Step-by-Step Solution:

1. **Definition of a Nucleoside**:
A nucleoside is a compound formed when a nitrogenous base (such as adenine, guanine, cytosine, or thymine) is attached to a sugar molecule (specifically a pentose sugar, which can be ribose or deoxyribose).

2. **Components of a Nucleoside**:
- **Nitrogenous Base**: This can be one of the four bases (adenine, guanine, cytosine, thymine).
- **Pentose Sugar**: This is typically ribose (in RNA) or deoxyribose (in DNA).

3. **Formation of a Nucleoside**:
A nucleoside is formed by the glycosidic bond between the nitrogenous base and the sugar. This process involves the removal of a water molecule (dehydration synthesis).

4. **Hydrolysis of a Nucleoside**:
Hydrolysis is the process of breaking down a compound by adding water. When a nucleoside undergoes hydrolysis, the glycosidic bond between the nitrogenous base and the sugar is broken.

5. **Products of Hydrolysis**:
Upon hydrolysis, a nucleoside yields:
- The original nitrogenous base (e.g., adenine)
- The corresponding pentose sugar (e.g., ribose or deoxyribose)

6. **Conclusion**:
Therefore, the products of hydrolysis of a nucleoside are the nitrogenous base and the pentose sugar.

### Final Answer:
A nucleoside on hydrolysis gives a nitrogenous base and a pentose sugar.