Which of the following exhibits specific activity in a catalytic reaction ?

Options

A. Catalyst
B. Promoter
C. Catalyst poison
D. All the three

Answer

To determine which of the given options exhibits specific activity in a catalytic reaction, we need to analyze the roles of each substance mentioned in the options.

### Step-by-Step Solution:

1. **Understanding Catalytic Reactions**:
- A catalytic reaction is a chemical process that is accelerated by a substance called a catalyst, which remains unchanged at the end of the reaction.

2. **Identifying the Options**:
- The options provided are:
1. Catalyst
2. Promoter
3. Catalyst Poison
4. All of the above

3. **Analyzing Each Option**:
- **Option 1: Catalyst**
- A catalyst is a substance that increases the rate of a chemical reaction without undergoing any permanent change itself. It plays a specific role in the catalytic reaction.
- **Conclusion**: This option exhibits specific activity.

- **Option 2: Promoter**
- A promoter is a substance that is added to a solid catalyst to enhance its performance in a chemical reaction. It also plays a specific role in the catalytic process.
- **Conclusion**: This option exhibits specific activity.

- **Option 3: Catalyst Poison**
- A catalyst poison is a substance that decreases the effectiveness of a catalyst in a chemical reaction. Although it reduces the activity, it still exhibits a specific role in the catalytic reaction.
- **Conclusion**: This option exhibits specific activity.

4. **Final Conclusion**:
- Since all three options (catalyst, promoter, and catalyst poison) exhibit specific activity in a catalytic reaction, the correct answer is:
- **Option 4: All of the above**