The reaction `CH_3-underset(CH_3)underset(|)overset(CH_3)overset(|)C-ONa+CH_3CH_2Clunderset(-NaCl)rarrCH_3-underset(CH_3)underset(|)overset(CH_3)overset(|)C-O-CH_2-CH_3`
is called

Options

A. Williamson continuous etherification process
B. Gatterman - Koch reaction
C. Etard reaction
D. Williamson Synthesis

Answer

To solve the question regarding the reaction of `CH3(CH3)3C-ONa + CH3CH2Cl → CH3(CH3)3C-O-CH2-CH3`, we need to identify the type of reaction that is taking place.

### Step-by-Step Solution:

1. **Identify the Reactants and Products**:
- The reactants are `CH3(CH3)3C-ONa` (sodium tert-butoxide) and `CH3CH2Cl` (ethyl chloride).
- The product is `CH3(CH3)3C-O-CH2-CH3` (tert-butyl ethyl ether).

2. **Recognize the Reaction Type**:
- This reaction involves the formation of an ether from an alcohol (or alkoxide) and an alkyl halide.
- The alkoxide ion (from sodium tert-butoxide) acts as a nucleophile and attacks the electrophilic carbon of the alkyl halide (ethyl chloride).

3. **Mechanism of the Reaction**:
- The nucleophilic attack leads to the displacement of the halide ion (Cl-) and the formation of the ether bond (C-O).
- This process is characteristic of the Williamson Ether Synthesis.

4. **Conclusion**:
- The reaction is classified as Williamson Ether Synthesis, which is a well-known method for synthesizing ethers.

### Final Answer:
The reaction is called **Williamson Ether Synthesis**.