To prepare a pure sample of n-hexane, using sodium metal as one of the reactant, the other reactant(s) will be

Options

A. ethyl chloride and n-butyl chloride
B. methyl bromide and n-pentyl bromide
C. n-propyl bromide
D. ethyl bromide and n-butyl bromide.

Answer

To prepare a pure sample of n-hexane using sodium metal as one of the reactants, we can follow these steps:

### Step 1: Understand the Reaction
We need to recognize that we are using the Wurtz reaction, which involves the coupling of alkyl halides in the presence of sodium metal to form alkanes.

### Step 2: Identify the Alkyl Halide
To obtain n-hexane (C6H14), we need to choose an appropriate alkyl halide. The simplest choice is n-propyl bromide (C3H7Br), which has three carbon atoms.

### Step 3: Write the Reaction
The reaction can be represented as follows:
\[ 2 \text{C}_3\text{H}_7\text{Br} + 2 \text{Na} \rightarrow \text{C}_6\text{H}_{14} + 2 \text{NaBr} \]
Here, two moles of n-propyl bromide react with sodium metal to produce one mole of n-hexane and sodium bromide as a byproduct.

### Step 4: Conclusion
Thus, the other reactant needed to prepare a pure sample of n-hexane using sodium metal is n-propyl bromide.

### Final Answer
The other reactant(s) will be n-propyl bromide (C3H7Br).

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