Step 1: Understand the type of reaction described.
The reaction involves an aryl halide and an alkyl halide with sodium metal in dry ether. This combination of reactants is characteristic of the Wurtz-Fittig reaction, which is a type of organic reaction used to form substituted aromatic compounds.
Step 2: Recognize the components of the Wurtz-Fittig reaction.
- Wurtz reaction typically involves the coupling of alkyl halides using sodium metal.
- Fittig reaction is a variation where aryl halides react with alkyl halides in the presence of sodium metal to form substituted aromatics.
Step 3: Final conclusion.
Thus, the reaction described is the Wurtz-Fittig reaction, as it involves both alkyl and aryl halides with sodium metal.
The correct answer is:
\[
\boxed{(3)\ \text{Wurtz-Fittig reaction}}
\]