Question: what are the requirements of a good solvent for extraction?
Answer: Immiscible pair of solvents: water and low polarity organic solvents. The extracting solvent must be immiscible with the solution to be extracted. ... 
Good solubility of the target compound. ... 
Poor solubility of impurities. ... 
Volatility of the extraction solvent. ... 
Toxicity and safety properties of the extraction solvent.