Assertion:- `CH_(3)Cl` has more dipole moment than `CH_(3)F`
Reason:- The charge separation is larger in `CH_(3)Cl` compared to `CH_(3)F`.

Options

A. If both Assertion `&` Reason are True `&` the Reason is a correct explanation of the Assertion.
B. If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion `&` Reason are False.

Answer

To solve the assertion and reason question regarding the dipole moments of CH₃Cl and CH₃F, we can follow these steps:

### Step 1: Understand the Assertion
The assertion states that CH₃Cl has a greater dipole moment than CH₃F.

- **Dipole Moment**: It is a measure of the separation of positive and negative charges in a molecule. The formula for dipole moment (μ) is given by:
\[ \mu = q \times d \]
where \( q \) is the charge and \( d \) is the distance between the charges.

### Step 2: Analyze the Molecules
- **CH₃Cl (Chloromethane)**: Chlorine (Cl) is larger in size compared to fluorine (F). This means that the bond length (distance) between the carbon and chlorine will be greater than that between carbon and fluorine.

- **CH₃F (Fluoromethane)**: Fluorine (F) is smaller in size, leading to a shorter bond length between carbon and fluorine.

### Step 3: Compare Charge Separation
- In CH₃Cl, the larger size of chlorine results in a greater charge separation due to the longer bond length. This contributes to a larger dipole moment.
- In CH₃F, the smaller size of fluorine results in a smaller charge separation due to the shorter bond length, leading to a smaller dipole moment.

### Step 4: Conclusion on Assertion
Since CH₃Cl has a larger charge separation due to the longer bond length, it indeed has a greater dipole moment than CH₃F. Therefore, the assertion is true.

### Step 5: Understand the Reason
The reason states that the charge separation is larger in CH₃Cl compared to CH₃F. This statement is also true, as we have established that the bond length in CH₃Cl is greater, leading to a larger charge separation.

### Step 6: Determine the Relationship
Since both the assertion and the reason are true, and the reason correctly explains the assertion, we conclude that:
- **Both assertion and reason are true, and the reason is the correct explanation of the assertion.**

### Final Answer
Both assertion and reason are true, and the reason is the correct explanation of the assertion.

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