ANS:C - differential

Rayleigh's equation is typically applied to differential distillation. Differential distillation is a method used for separating a mixture of two or more components based on the differences in their vapor pressures. Rayleigh's equation describes the relationship between the composition of the liquid and vapor phases at equilibrium during differential distillation. It helps to determine the composition of the distillate and residue streams as a function of the number of theoretical stages in the distillation process. In continuous distillation, steam distillation, and flash distillation, different equations or methods are typically used to analyze and design the distillation processes.