The temperature coefficient of most of the reactions lies between

Options

A. 1 & 3
B. 2 & 3
C. 1 & 4
D. 2 & 4

Answer

To solve the question regarding the temperature coefficient of most chemical reactions, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding Temperature Coefficient**:
The temperature coefficient (often denoted as \( Q_{10} \)) is defined as the ratio of the rate constant of a reaction at a temperature \( T + 10°C \) to the rate constant at temperature \( T \). Mathematically, it can be expressed as:
\[ Q_{10} = \frac{k(T + 10)}{k(T)} \]
where \( k \) is the rate constant of the reaction.

2. **Finding the Typical Range**:
For most chemical reactions, empirical observations suggest that the temperature coefficient typically lies within a certain range. It is commonly accepted that for many reactions, the value of \( Q_{10} \) falls between 2 and 3. This means that for a 10°C increase in temperature, the rate of the reaction can approximately double (2 times) or triple (3 times).

3. **Analyzing the Options**:
Given the options:
- A) 1 and 3
- B) 2 and 3
- C) 1 and 4
- D) 2 and 4

We can see that the most appropriate choice based on our understanding of the temperature coefficient is option B, which states that the temperature coefficient of most reactions lies between 2 and 3.

4. **Conclusion**:
Therefore, the answer to the question is:
\[ \text{Option B: 2 and 3} \]