Which of the following are plasticisers?

Options

A. `DOP`
B. `DBP`
C. Cryesyl phosphate
D. Sodium adipate

Answer

To determine which of the following substances are plasticizers, we will analyze each option based on their characteristics and uses.

### Step-by-Step Solution:

1. **Understanding Plasticizers**:
- Plasticizers are additives that increase the plasticity or fluidity of materials, primarily used in plastics like polyvinyl chloride (PVC).

2. **Identifying the Options**:
- We need to evaluate each option provided to see if they qualify as plasticizers.

3. **Evaluating DOP (Dioctyl Phthalate)**:
- DOP is widely recognized as a plasticizer used in various applications such as flooring materials, carpet, and notebook covers.
- **Conclusion**: DOP is a plasticizer. (Correct)

4. **Evaluating DBP (Dibutyl Phthalate)**:
- DBP is also known to be used as a plasticizer in many applications, similar to DOP.
- **Conclusion**: DBP is a plasticizer. (Correct)

5. **Evaluating Cryosyl Phosphate**:
- Cryosyl phosphate is another compound that is used as a plasticizer in various formulations.
- **Conclusion**: Cryosyl phosphate is a plasticizer. (Correct)

6. **Evaluating Sodium Adipate**:
- Sodium adipate is classified as an adipate salt and is primarily used as an acidity regulator rather than a plasticizer.
- **Conclusion**: Sodium adipate is not a plasticizer. (Incorrect)

### Final Answer:
- The substances that are plasticizers from the options given are DOP, DBP, and Cryosyl phosphate. Sodium adipate is not a plasticizer.

### Summary of Correct Options:
1. DOP - Correct
2. DBP - Correct
3. Cryosyl Phosphate - Correct
4. Sodium Adipate - Incorrect