A mixture of acetone and CCl₄ can be separated by
 

(a) is used only to separate azeotropes, i.e., constant boiling mixture.
(b) is correct because CCl₄ and acetone differ in their boiling point.
(c) is used only in case of steam volatile substance. It is not correct.
(d) Vacuum distillation is used in liquids which decompose at their boiling point.
Hence, the correct answer is (2).