The major product formed by the reaction of a anisole with
tert-butyl alcohol in presence of `Li//Liq NH_(3)` is

Options

A. `1 -` methoxy cyclohexa `- 1, 4 -`diene
B. `2 -` methoxy cyclohexa `- 1, 3 -`diene
C. `1 -` methoxy cyclohexa `- 1, 3 -`diene
D. `3 -` methoxy cyclohexa `- 1, 4 -`diene

Explanation

To solve the problem of determining the major product formed by the reaction of anisole with tert-butyl alcohol in the presence of lithium and liquid ammonia, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants are anisole (C6H5OCH3) and tert-butyl alcohol ((CH3)3COH).
- Anisole has a methoxy group (-OCH3) attached to a benzene ring.

2. **Understand the Reaction Conditions**:
- The presence of lithium and liquid ammonia indicates a reduction reaction. Lithium in liquid ammonia is a strong reducing agent.

3. **Reduction of Anisole**:
- When anisole is treated with lithium in liquid ammonia, the methoxy group can be reduced. This leads to the formation of a cyclohexadiene structure.
- The reaction involves the addition of hydrogen atoms to the aromatic ring, resulting in the formation of a double bond.

4. **Formation of the Intermediate Product**:
- The reduction of anisole leads to the formation of cyclohexadiene with a methoxy group still attached. The structure can be represented as:
- Cyclohexene with a methoxy substituent.

5. **Reaction with tert-Butyl Alcohol**:
- In the presence of tert-butyl alcohol, the cyclohexadiene can undergo further reactions. The tert-butyl group can act as a leaving group, leading to the formation of a more stable product.
- The reaction will involve the removal of two hydrogen atoms and the introduction of the tert-butyl group.

6. **Final Product Formation**:
- The final product will be a substituted cyclohexene with a tert-butyl group and a methoxy group. The correct structure is cyclohexa-1,4-diene with a methoxy group.
- The product can be named as 1,4-dimethoxycyclohexene.

7. **Conclusion**:
- The major product formed from the reaction of anisole with tert-butyl alcohol in the presence of lithium and liquid ammonia is **cyclohexa-1,4-diene** with a methoxy group.