A : Xe is the only element of group 18 which from compounds .
R : Xe does not form clatherates

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2)
C. If Assertion is true statement but Reason is false , then mark (3)
D. If both Assertion and Reason are false statements , then mark (4)

Answer

To solve the question, we need to evaluate the assertion and reason provided:

**Assertion (A):** Xenon (Xe) is the only element of group 18 that forms compounds.
**Reason (R):** Xenon does not form clathrates.

### Step 1: Analyze the Assertion
- Group 18 elements, also known as noble gases, typically have a complete octet, making them chemically unreactive.
- However, xenon is known to form several compounds, such as xenon tetrafluoride (XeF4) and xenon trioxide (XeO3), with highly electronegative elements like fluorine and oxygen.
- While xenon is indeed the most reactive noble gas and forms compounds, it is not the only one. Argon and helium can also form compounds under specific conditions (e.g., argon fluorohydride, HArF, and sodium compounds with helium at high pressures).
- Therefore, the assertion that xenon is the only element of group 18 that forms compounds is **false**.

### Step 2: Analyze the Reason
- Clathrates are compounds formed when gas molecules (often noble gases) are trapped in the cavities of a crystal lattice of another substance.
- Xenon, being a larger noble gas, can indeed form clathrates, while smaller noble gases like helium and neon do not form clathrates due to their smaller size, allowing them to escape from the cavities.
- Thus, the reason that "xenon does not form clathrates" is also **false**.

### Conclusion
Both the assertion and the reason are false. Therefore, the correct answer is that both A and R are false statements.

### Final Answer
Both assertion and reason are false.

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