Assertion:- Ter-butyl chloride on treatment with Na metal gives isobutane and Isobutylene.
Reason:- It is known as wurtz reaction.

Options

A. If both Assertion `&` Reason are True `&` the Reason is a correct explanation of the Assertion.
B. If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion `&` Reason are False.

Answer

To solve the question regarding the assertion and reason about ter-butyl chloride and its reaction with sodium metal, we will break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that ter-butyl chloride (tert-butyl chloride) on treatment with sodium metal gives isobutane and isobutylene.
- Tert-butyl chloride has the structure:
\[ (CH_3)_3CCl \]

2. **Reaction with Sodium Metal**:
- When tert-butyl chloride reacts with sodium metal, it does not undergo the Wurtz reaction, which typically involves the coupling of two alkyl halides to form alkanes.
- Instead, it undergoes an elimination reaction due to the presence of a tertiary carbon, leading to the formation of alkenes and alkanes.

3. **Products of the Reaction**:
- The products formed from the reaction of tert-butyl chloride with sodium metal are:
- Isobutane (C4H10), which is a saturated hydrocarbon.
- Isobutylene (C4H8), which is an unsaturated hydrocarbon (alkene).
- The reaction can be summarized as:
\[ (CH_3)_3CCl + 2Na \rightarrow C_4H_{10} + C_4H_8 + 2NaCl \]

4. **Conclusion on Assertion**:
- The assertion is **true** because tert-butyl chloride does yield isobutane and isobutylene upon reaction with sodium metal.

5. **Understanding the Reason**:
- The reason states that this reaction is known as the Wurtz reaction.
- The Wurtz reaction typically involves the coupling of two alkyl halides (usually primary) in the presence of sodium to form alkanes, not alkenes.

6. **Conclusion on Reason**:
- The reason is **false** because the reaction of tert-butyl chloride with sodium does not fit the definition of the Wurtz reaction, as it produces alkenes rather than alkanes.

7. **Final Answer**:
- Since the assertion is true and the reason is false, the correct answer is: **Assertion is true, but the reason is false**.