Sodium tertiary butoxide forms ether only with :

Options

A.
B. `CH_(3)-X`
C. `H_(3)C-overset(X)overset(|)(CH)-CH_(3)`
D. `H_(3)C-underset(CH_(3))underset(|)overset(X)overset(|)(C)-CH_(3)`

Explanation

To solve the question "Sodium tertiary butoxide forms ether only with:", we need to analyze the reactivity of sodium tertiary butoxide (Na⁺[C(CH₃)₃O]⁻) in the context of ether formation.

### Step-by-Step Solution:

1. **Understanding Sodium Tertiary Butoxide**:
Sodium tertiary butoxide is the sodium salt of tertiary butyl alcohol (C(CH₃)₃OH). It can be represented as Na⁺[C(CH₃)₃O]⁻, where the alkoxide ion (C(CH₃)₃O⁻) acts as a strong nucleophile.

**Hint**: Remember that sodium tertiary butoxide is derived from a tertiary alcohol, which influences its reactivity.

2. **Reactivity of Alkoxide Ions**:
Alkoxide ions are strong nucleophiles and can also act as bases. However, their ability to form ethers depends on the nature of the alkyl halide they react with.

**Hint**: Consider the nucleophilic strength of alkoxide ions and how it affects their reactions with different types of alkyl halides.

3. **Types of Alkyl Halides**:
- **Primary Alkyl Halides**: React well with alkoxide ions to form ethers.
- **Secondary Alkyl Halides**: Steric hindrance makes them less reactive with alkoxide ions, often leading to elimination reactions instead of ether formation.
- **Tertiary Alkyl Halides**: React poorly with alkoxide ions due to steric hindrance and typically undergo elimination reactions to form alkenes.

**Hint**: Identify the type of alkyl halide that would favor ether formation when reacted with a strong nucleophile.

4. **Conclusion**:
Sodium tertiary butoxide will effectively form ethers only with primary alkyl halides. For example, if we take a primary alkyl halide like methyl chloride (CH₃Cl), the reaction would yield tert-butyl methyl ether (C(CH₃)₃OCH₃).

**Hint**: Look for a primary alkyl halide in the options provided to determine the correct answer.

### Final Answer:
Sodium tertiary butoxide forms ether only with primary alkyl halides.