Final answer:
Ethyl alcohol is not suitable for extraction with water because it is miscible with water, not because of its boiling point, toxicity, or cost.
Step-by-step explanation:
The reason why ethyl alcohol would not be a good solvent to use with water in an extraction is because it is highly miscible with water. The miscibility means that ethyl alcohol mixes well in all proportions with water, which defeats the purpose of an extraction process that typically relies on immiscibility to separate substances. The other listed characteristics, such as high boiling point, toxicity, and cost, do not primarily dictate the ability of ethyl alcohol to be used in an extraction with water. Ethyl alcohol does not have a particularly high boiling point, it is not prohibitively expensive, and while it can be toxic in large doses, the toxicity is not relevant to its effectiveness as a solvent in an extraction process.