Simple distillation is used to separate two liquids with a large difference in boiling points.
Fractional distillation is used to separate two liquids with close boiling points.
Steam distillation is used to separate steam volatile compounds.
Distillation under reduced pressure is used to separate liquids that decompose at their boiling points.
Therefore, the correct match is A-II, B-IV, C-I, D-III.
Answer: A-II, B-IV, C-I, D-III