Assertion: All clatharate compound of noble gas are the compounds in which the molecules of noble gases are trapped in cavities in te crystal lattice of other compounds.
Reason: He and Ne having smaller size do not form clathrate compound molecules because they are small enough to escape from cavities.

Options

A. Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1
B. Statement-1 is true, statement-2 is true, statement-2 is not correct explanation for statement-1
C. Statement-1 is true, statement-2 is false
D. Statement-1 is false, statement-2 is true

Answer

To analyze the given assertion and reason, we will break down the concepts involved step by step.

### Step 1: Understanding Clathrate Compounds
Clathrate compounds are inclusion compounds where gas molecules (in this case, noble gases) are trapped within the cavities of a crystal lattice formed by another compound.

**Hint:** Recall that clathrate compounds are often referred to as "cage-like" structures.

### Step 2: Evaluating the Assertion
The assertion states that "All clathrate compounds of noble gases are the compounds in which the molecules of noble gases are trapped in cavities in the crystal lattice of other compounds."

- This statement is true because clathrate compounds are defined by the presence of gas molecules trapped in a lattice structure.

**Hint:** Think about the definition of clathrate compounds and how they relate to noble gases.

### Step 3: Evaluating the Reason
The reason provided states that "He and Ne having smaller size do not form clathrate compound molecules because they are small enough to escape from cavities."

- This statement is also true. Helium (He) and Neon (Ne) are indeed smaller in size compared to other noble gases like Argon (Ar), Krypton (Kr), and Xenon (Xe). Their smaller size allows them to escape from the cavities in the clathrate structure, preventing the formation of clathrate compounds.

**Hint:** Consider the relationship between atomic size and the ability to form stable structures in chemistry.

### Step 4: Establishing the Connection
Now, we need to determine if the reason is a correct explanation for the assertion.

- The assertion is about the nature of clathrate compounds involving noble gases, while the reason explains why certain noble gases (He and Ne) do not form these compounds due to their size. Since the reason directly explains why He and Ne do not fit into the assertion about clathrate compounds, it is indeed a valid explanation.

**Hint:** Reflect on how the reason provides insight into the limitations of certain noble gases in forming clathrate structures.

### Conclusion
Both the assertion and reason are correct, and the reason is a correct explanation for the assertion. Therefore, the final answer is that both the assertion and reason are true, and the reason correctly explains the assertion.

**Final Answer:** Both the assertion and reason are correct, and the reason is the correct explanation for the assertion.