Assertion : Silicons are very inert polymers
Reason: Both `Si-O "and" Si-C` bond energies are very high

Options

A. If both (A) and (R) are true and (R) is the correct explanation of (A)
B. if both (A) and (R) are true but (R) is not correct explanation of (A)
C. If (A) is true but (R) is false
D. If (A) is false but (R) is false

Answer

To solve the question, we need to evaluate both the assertion and the reason provided, and determine their validity and relationship.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Silicons are very inert polymers."
- Polymers made from silicon, particularly organosilicon polymers, are known for their stability and resistance to chemical reactions. This is primarily due to the structure of these polymers, which often include silicon-oxygen (Si-O) linkages.

**Hint**: Consider the properties of polymers and the specific characteristics of silicon-based polymers.

2. **Understanding the Reason**:
- The reason given is that "Both Si-O and Si-C bond energies are very high."
- High bond energies indicate that the bonds are strong and require a significant amount of energy to break. This contributes to the overall stability of the silicon polymers, making them less reactive.

**Hint**: Reflect on how bond energies influence the reactivity of compounds.

3. **Evaluating the Assertion and Reason**:
- Since silicon polymers contain strong Si-O and Si-C bonds, they are less likely to undergo chemical reactions, supporting the assertion that they are inert.
- The bond energy of Si-O is approximately 502 kJ/mol, which is relatively high, indicating strong bonding. Similarly, Si-C bonds also exhibit high bond energies.

**Hint**: Think about the relationship between bond strength and chemical reactivity.

4. **Conclusion**:
- Both the assertion and the reason are true. The reason provides a correct explanation for the assertion because the high bond energies of Si-O and Si-C contribute to the inertness of silicon polymers.

**Final Answer**: Both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.

### Summary of the Answer:
- **Assertion**: True (Silicons are very inert polymers)
- **Reason**: True (Both Si-O and Si-C bond energies are very high)
- **Conclusion**: Reason correctly explains the Assertion.