Assertion( A) The boiling points of alkyl halides decrease in the order `RI gt RBr gt RCl gt RF`
Reason (R) The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.

Options

A. Assertion and reason both are correct and reason is correct explanation of assertion
B. Assertion and reason both are wrong statements
C. Assertion is correct but reason is wrong statement
D. Assertion and reason both are correct statements but reason is not correct explanation of assertion

Explanation

To solve the question regarding the assertion and reason related to the boiling points of alkyl halides, we can break it down into a step-by-step analysis.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
The assertion states that the boiling points of alkyl halides decrease in the order RI > RBr > RCl > RF. This implies that among the alkyl halides, iodoalkanes have the highest boiling point, followed by bromoalkanes, chloroalkanes, and finally fluoroalkanes.

**Hint**: Consider the molecular size and intermolecular forces when comparing the boiling points of these compounds.

2. **Analyzing the Reason**:
The reason given is that the boiling points of alkyl chlorides, bromides, and iodides are considerably higher than that of hydrocarbons of comparable molecular mass. This suggests that the presence of halogens in alkyl halides contributes to higher boiling points compared to hydrocarbons.

**Hint**: Think about the types of bonds and intermolecular forces present in alkyl halides versus hydrocarbons.

3. **Evaluating the Assertion**:
The assertion is based on the trend in boiling points due to the size of the halogen atoms. As we move from fluorine to iodine, the size of the halogen increases, leading to stronger van der Waals forces due to increased polarizability, which results in higher boiling points.

**Hint**: Recall that larger atoms can lead to stronger London dispersion forces.

4. **Evaluating the Reason**:
While the reason is true, it does not directly explain the trend stated in the assertion. The reason discusses the boiling points of alkyl halides in comparison to hydrocarbons, but it does not clarify why the boiling points decrease in the specific order RI > RBr > RCl > RF.

**Hint**: Consider whether the reason addresses the specific trend mentioned in the assertion.

5. **Conclusion**:
Since both the assertion and the reason are true statements, but the reason does not provide a correct explanation for the assertion, the correct answer is that both are correct, but the reason is not the correct explanation for the assertion.

### Final Answer:
The correct option is: **Assertion and reason both are correct statements, but reason is not the correct explanation of assertion.**