Identify the reactants `(X)` and `(Y)` for the following reaction, respectively.
`(X)+(Y)overset(NaNH_(2))rarr4-` Decyne

Options

A. `CH_(3)(CH_(2))_(4)CH_(2)-Cl+CH_(3)-C-=CH`
B. `CH_(3)(CH_(2))^(2)CH_(2)-Cl+CH_(3)-(CH_(2))_(2)-C-=CH`
C. `CH_(3)(CH_(2))_(2)CH_(2)-Cl+CH_(3)(CH_(2))-C-=CH`
D. `CH_(3)-CH_(2)-CH_(2)-Cl+CH_(3)(CH_(2))_(4)-C-=CH`

Explanation

To identify the reactants \( (X) \) and \( (Y) \) for the reaction that produces 4-decyne in the presence of sodium amide (\( \text{NaNH}_2 \)), we can follow these steps:

### Step 1: Understand the Reaction
The reaction involves the formation of 4-decyne, which is a terminal alkyne with the formula \( \text{C}_{10}\text{H}_{18} \). The general reaction involves an alkyne and an alkyl halide reacting in the presence of a strong base.

### Step 2: Identify the Structure of 4-decyne
4-decyne has the structure:
```
CH3-CH2-CH2-C≡C-CH2-CH2-CH2-CH2-CH3
```
This indicates that it has a total of 10 carbon atoms, with the triple bond located between the 4th and 5th carbon atoms.

### Step 3: Determine Reactants \( (X) \) and \( (Y) \)
1. **Alkyne \( (X) \)**: To form 4-decyne, we need a suitable alkyne that can provide the necessary carbon chain. A suitable choice is 1-butyne \( (CH_3CH_2C≡CH) \) because it has 4 carbons and can be extended to 10 carbons through nucleophilic substitution.

2. **Alkyl Halide \( (Y) \)**: The alkyl halide must provide the remaining 6 carbons. A suitable alkyl halide is 1-bromohexane \( (CH_3(CH_2)_5Br) \) which has 6 carbons.

### Step 4: Reaction Mechanism
- The strong base \( \text{NaNH}_2 \) will abstract the acidic hydrogen from 1-butyne, forming a nucleophile \( (C_4H_9^-) \).
- This nucleophile will then attack the alkyl halide (1-bromohexane), leading to the formation of 4-decyne.

### Conclusion
Thus, the reactants \( (X) \) and \( (Y) \) are:
- \( (X) \): 1-butyne \( (CH_3CH_2C≡CH) \)
- \( (Y) \): 1-bromohexane \( (CH_3(CH_2)_5Br) \)