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Assertion: SiF4 acts as a Lewis base. ...

Assertion: `SiF_4 ` acts as a Lewis base.
Reason: The central Si atom in `SiF_4` possesses vacant d- orbitals and can expand its octet by accommodating more electrons in d- orbitals
1. If both Assertion and Reason are CORRECT and a Reason is the CORRECT explanations of the Assertion
2. If both Assertion and Reason are CORRECT but Reaon is not CORRECT explanation of the Assertion.
3. If Assertion is CORRECT but Reasson is INCORRECT.
4. If Assertion is INCORRECT but Reason is CORRECT.

A

If both Assertion and Reason are CORRECT and a Reason is the CORRECT explanations of the Assertion

B

If both Assertion and Reason are CORRECT but Reaon is not CORRECT explanation of the Assertion.

C

If Assertion is CORRECT but Reasson is INCORRECT.

D

If Assertion is INCORRECT but Reason is CORRECT.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Analyze the Assertion The assertion states that `SiF_4` acts as a Lewis base. A Lewis base is defined as a substance that can donate a pair of electrons to form a covalent bond. - **Fact Check**: `SiF_4` is actually known to act as a Lewis acid rather than a Lewis base. This is because it can accept electron pairs due to the presence of a vacant orbital in silicon. ### Step 2: Analyze the Reason The reason states that the central Si atom in `SiF_4` possesses vacant d-orbitals and can expand its octet by accommodating more electrons in d-orbitals. - **Fact Check**: Silicon is in the third period of the periodic table and does indeed have vacant d-orbitals. This allows it to expand its octet and accept electron pairs, which supports its behavior as a Lewis acid. ### Conclusion - The assertion is **incorrect** because `SiF_4` does not act as a Lewis base; it acts as a Lewis acid. - The reason is **correct** because it accurately describes the ability of silicon to expand its octet due to vacant d-orbitals. ### Final Answer Since the assertion is incorrect and the reason is correct, the correct option is: **4. If Assertion is INCORRECT but Reason is CORRECT.** ---
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