Mass Transfer
Molecular distillation is

High temperature distillation
For heat-sensitive materials
Both B and C
Very low pressure distillation

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Temperature is less
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Saturated steam is used for steam distillation
Total pressure is less

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