RNA is more reactive or unstable to DNA due to presence of :-

Options

A. `-OH` group on `2^(nd)` position of ribose sugar
B. `-OH` group on `3^(rd)` position of deoxy ribose sugar
C. `-` Phosphate group on `5^(th)` position of ribose sugar
D. `-OH` group on `1^(st)` position of ribose sugar

Answer

To answer the question of why RNA is more reactive or unstable than DNA, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Key Components**:
- Understand that both RNA and DNA are nucleic acids composed of nucleotides, which include a sugar, phosphate group, and nitrogenous base.
- The sugars in RNA and DNA are different: RNA contains ribose sugar, while DNA contains deoxyribose sugar.

2. **Compare the Sugars**:
- Ribose sugar in RNA has a hydroxyl (OH) group attached to the second carbon atom.
- Deoxyribose sugar in DNA lacks this hydroxyl group at the second carbon; instead, it has only a hydrogen atom (H) at that position.

3. **Analyze the Impact of the Hydroxyl Group**:
- The presence of the hydroxyl group (-OH) on the second carbon of ribose makes RNA more reactive. This is because the hydroxyl group can participate in chemical reactions, making RNA less stable.
- In contrast, the absence of this hydroxyl group in deoxyribose contributes to the stability of DNA.

4. **Conclusion**:
- Therefore, the correct answer to the question is that RNA is more reactive or unstable than DNA due to the presence of the hydroxyl group on the second position of ribose sugar.

### Final Answer:
RNA is more reactive or unstable than DNA due to the presence of the **OH group on the second position of ribose sugar**.

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