A liquid with high boiling point decomposes on simple distillation but it can be steam distilled for its purification. Explain how is it possible?

A liquid with high boiling point decomposes on simple distillation but

1.	A liquid with high boiling point decomposes on simple distillation but it can be steam distilled for its purification. Explain how is it possible?
Answer» Solution :In vapour phase distillation vapour of organic compound and water is distilled out water vapour is passed in LIQUID which should be purified. So, vapour of liquid and vapour of water rises up and pass in condenser. So, liquid and water remain non-misible and form separate layer. When the total vapour PRESSURE of liquid and water becomes equal to ATMOSPHERIC pressure than distillation take place. so, `(p_(1) + p_(2))= p " " p_(1) lt p and p_(2) lt p` `:. p_(1) = (p- p_(2))` Vapour pressure of organic liquid (A) is less than total pressure (p). so, vapour distillation take place at lower temperature than BOILING POINT