Consider the following statements and arrange in order of true/false as given in the codes.
`S_1`: Vapour pressure is a colligative property.
`S_2`:Freezing point of a solution is always lower than of the pure solvent
`S_3`: Acetic acid undergoes association in benzene The molar mass of acetic acid, determined by elevation of boiling point is always higher than its normal molar mass.
`S_4`: Osomotic pressure measurements can be used for determination of molar mass of polymers.

Options

A. FFFF
B. FTTT
C. TTTT
D. TFTF

Explanation

To solve the question, we need to evaluate each statement one by one and determine whether they are true or false.

### Step 1: Analyze Statement S1
**Statement S1**: Vapour pressure is a colligative property.

- **Explanation**: Colligative properties depend on the number of solute particles in a solution and not on their identity. However, vapour pressure itself is not a colligative property; rather, it is the change in vapour pressure (relative lowering of vapour pressure) that is a colligative property. Therefore, this statement is **False**.

### Step 2: Analyze Statement S2
**Statement S2**: Freezing point of a solution is always lower than that of the pure solvent.

- **Explanation**: This statement is true because the addition of a solute to a solvent lowers the freezing point of the solution compared to the pure solvent. This phenomenon is known as freezing point depression. Therefore, this statement is **True**.

### Step 3: Analyze Statement S3
**Statement S3**: Acetic acid undergoes association in benzene. The molar mass of acetic acid, determined by elevation of boiling point, is always higher than its normal molar mass.

- **Explanation**: Acetic acid does associate in benzene due to hydrogen bonding, which results in a higher apparent molar mass when measured by colligative properties such as boiling point elevation. The normal molar mass of acetic acid is 60 g/mol, but due to association, the measured molar mass can be higher. Therefore, this statement is **True**.

### Step 4: Analyze Statement S4
**Statement S4**: Osmotic pressure measurements can be used for determination of molar mass of polymers.

- **Explanation**: This statement is true. Osmotic pressure is a colligative property that can be used to determine the molar mass of polymers, especially because it is effective at room temperature and can handle large macromolecules. Therefore, this statement is **True**.

### Summary of Results
- **S1**: False
- **S2**: True
- **S3**: True
- **S4**: True

### Final Arrangement of Statements
Based on the evaluations:
1. S1: False
2. S2: True
3. S3: True
4. S4: True

### Conclusion
The correct order of statements in terms of true/false is:
- S1: False
- S2: True
- S3: True
- S4: True

Thus, the answer is: **F, T, T, T**.