Statement-1 : The observed molar mass of acetic acid in benzene is more than the normal molar mass of acetic acid.
Statement-2 : Molecules of acetic and dimerise in benzene due to hydrogen bonding.

Options

A. If both the statements are TURE and STATEMENT-2 is the correct explanation STATEMENT-1
B. If both the statements are TURE but STATEMENT-2 is NOT the correct explanation STATEMENT-1
C. If STATEMENT-1 is TURE and STATEMENT-2 is FALSE
D. If STATEMENT-1 is FA,SE and STATEMENT-2 is TRUE

Answer

To solve the question, we need to analyze both statements and determine their correctness, as well as the relationship between them.

### Step-by-Step Solution:

1. **Understanding Statement 1**:
- The statement claims that the observed molar mass of acetic acid in benzene is greater than the normal molar mass of acetic acid.
- The normal molar mass of acetic acid (CH₃COOH) is approximately 60 g/mol.

2. **Understanding Dimerization**:
- Acetic acid can dimerize in non-polar solvents like benzene due to hydrogen bonding.
- When two acetic acid molecules (CH₃COOH) dimerize, they form a dimer (C₂H₄O₄), which has a combined molar mass of about 120 g/mol.

3. **Calculating Observed Molar Mass**:
- If acetic acid dimerizes in benzene, the observed molar mass will reflect the mass of the dimer rather than individual acetic acid molecules.
- Therefore, the observed molar mass of acetic acid in benzene will be higher than the normal molar mass of acetic acid.

4. **Conclusion for Statement 1**:
- Since the observed molar mass (due to dimerization) is indeed greater than the normal molar mass, Statement 1 is correct.

5. **Understanding Statement 2**:
- This statement claims that acetic acid molecules dimerize in benzene due to hydrogen bonding.
- The presence of hydrogen bonding between the hydrogen atom of one acetic acid molecule and the oxygen atom of another leads to the formation of dimers.

6. **Conclusion for Statement 2**:
- Since dimerization occurs due to hydrogen bonding, Statement 2 is also correct.

7. **Relationship Between Statements**:
- Statement 2 provides a valid explanation for why Statement 1 is true. The dimerization of acetic acid in benzene results in an observed molar mass that is greater than the normal molar mass.

### Final Conclusion:
- Both statements are correct, and Statement 2 correctly explains Statement 1.

### Answer:
Both statements are true, and Statement 2 is the correct explanation for Statement 1.

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