Assertion : `CO_2` has stronger intermolecular forces than `CH_4`.
Reason : Critical temperature of `CO_2` is more.

Options

A. A and R both are correct, and R is correct explanation of A.
B. A and R both are correct, but R is not correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.

Answer

To solve the assertion and reason question, we will analyze both the assertion and the reason step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that carbon dioxide (CO₂) has stronger intermolecular forces than methane (CH₄). To evaluate this, we need to consider the types of intermolecular forces present in both substances.

2. **Types of Intermolecular Forces**:
- CO₂ is a polar molecule due to the presence of a double bond between carbon and oxygen, which leads to dipole-dipole interactions and London dispersion forces.
- CH₄ is a nonpolar molecule that primarily exhibits London dispersion forces.

3. **Comparison of Intermolecular Forces**: Since CO₂ has dipole-dipole interactions in addition to London dispersion forces, it can be concluded that CO₂ has stronger intermolecular forces compared to CH₄, which only has London dispersion forces.

4. **Understanding the Reason**: The reason states that the critical temperature of CO₂ is higher than that of CH₄. The critical temperature is the temperature above which a substance cannot be liquefied, regardless of the pressure applied.

5. **Relationship Between Intermolecular Forces and Critical Temperature**: There is a direct relationship between the strength of intermolecular forces and the critical temperature. Stronger intermolecular forces result in a higher critical temperature because it requires more energy (higher temperature) to overcome these forces and convert the liquid into a gas.

6. **Conclusion**: Since CO₂ has stronger intermolecular forces than CH₄, it will have a higher critical temperature. Therefore, both the assertion and the reason are correct, and the reason supports the assertion.

### Final Answer:
- Both the assertion and the reason are correct, and the reason correctly explains the assertion.

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