Question

Distillation 11 4. The organic liaud in Sicam distillatior vaporites at: a) Lower temperature than its boiling point b) Higher temperature than its boiling point c) At its boiling point d) None of the mentioned 2. In steam distillation, the liquid boils when th allation, the liquid boils when the sum of the organic liquid vapor pressure and the water vapor pressure is: a) Greater than atmospheric pressure b) Lesser than atmospheric pressure Equals to atmospheric pressure d) None of the mentioned 3. Steam distillation process is used to separate substances which are a) Steam volatile b) Steam volatile and immiscible with water c) Steam volatile and miscible with water d) All of the mentioned 4. What is the definition of immiscible? (2 points) 5. Name the functional group found in Limonene (1 point) 6. Draw the structure of D-Limonene and isoprene. How many isoprene units ar Limonene. (3 points) 7. What is the advantage of using steam distillation over normal distillation in this experiment? (3 points) F

Answer 1

1) as in steam distillation, there is two immiscible liquid, they exert their pure vapour pressure in the mixture also. So, total vapour pressure of the system is less than vapour pressure of any pure consituent of the mixture. . So, correct ans will be (@ a & Organic liquid in steam distillation raparises at a) Lower than its boiling point.fi (3) In steam distillation, any consituent liquid boils when the sum of organic I liguid vapour presure and the water vapour V presswie is equal to atmos pheric pressure. © w 5 Steam distillation is used to separate slibstances which are b) Steam volatile and immsic' He with I water for © immiscible - Two substances are immsicible if their certain proportion form a mixture, not solution for liquids we can say that two liquids are immiscible if they does not alter any properties of any other liquid in solution and they exert their independently as if the other component is not present there. ) Example: – oil and water; butanone and water A the

6 in Limonine 2 alkene moity is the is a aliphatic hydrocarbon. kene moity is there. It (D) Limoline isoprene (eng= <-CH=CH2) CH2 & (D) - Limoline is monoterpenoid. 3 son it contain 2- isoprene units in it over normal distillation (7) The main advantage of steam distillation is mixing of two immiscible liquid reduces the boiling point of the mixture and mostly temperature. U sensitive organic compound (which can be decomposed) at high temperature easily distilled