The correct answer is: C. 1 and 3
Statement 1 is correct. Two immiscible liquids can be separated by a separating funnel. The liquids are poured into the funnel and the funnel is then left to stand. The denser liquid will sink to the bottom of the funnel, while the less dense liquid will float on top. The liquids can then be poured off separately.
Statement 2 is incorrect. Chromatography is a technique that can be used to separate mixtures of compounds. However, it is not the latest technique for purification, isolation and separation of organic compounds. The latest technique is called high-performance liquid chromatography (HPLC).
Statement 3 is correct. Oils can be purified by steam distillation. Steam distillation is a process that uses steam to vaporize a liquid. The vapor is then condensed back into a liquid, which is purified from the original liquid.
Therefore, the correct answer is C. 1 and 3.