Assertion Boiling point of halogen acids are in the order `HF gtHBr gt HCl gt HI`
Reasoning Electronegativities are in the order `F gt Cl gt Br gt I` .

Options

A. If both `(A)` and `(R )` are correct and `(R )` is the correct
explanation of `(A)`
B. If both `(A)` and `(R )` are correct and `(R )` is the correct
explanation of `(A)`
C. If `(A)` is correct but `(R )` is incorrect
D. If `(A)` is incorrect but `(R )` is correct

Explanation

To solve the assertion and reasoning question regarding the boiling points of halogen acids and their electronegativities, we can follow these steps:

### Step 1: Understand the Assertion
The assertion states that the boiling points of halogen acids are in the order \( HF > HBr > HCl > HI \). We need to evaluate if this order is correct.

### Step 2: Analyze the Reasoning
The reasoning provided states that the electronegativities of the halogens are in the order \( F > Cl > Br > I \). We need to confirm if this order is accurate.

### Step 3: Evaluate the Reasoning
The reasoning is based on the trend of electronegativity in Group 17 (the halogens). As we move down the group from fluorine to iodine, the size of the atoms increases, which leads to a decrease in electronegativity. This statement is correct.

### Step 4: Evaluate the Assertion
Now, let's analyze the boiling points of the halogen acids:
- **HF**: Has the highest boiling point due to strong intermolecular hydrogen bonding.
- **HCl, HBr, HI**: These do not exhibit hydrogen bonding. Instead, their boiling points are influenced by Van der Waals forces, which increase with molecular size.

As we move down the group:
- **HCl** has a lower boiling point than **HBr** and **HI** because it is smaller in size compared to **HBr** and **HI**.
- **HI** has the highest boiling point among HCl, HBr, and HI due to its larger size leading to stronger Van der Waals forces.

Thus, the correct order of boiling points should be:
\[ HF > HI > HBr > HCl \]

### Step 5: Conclusion
The assertion that the boiling points of halogen acids are in the order \( HF > HBr > HCl > HI \) is incorrect. However, the reasoning regarding electronegativities is correct.

### Final Answer
- **Assertion**: Incorrect
- **Reasoning**: Correct