JEE Main 20268 AprilEvening Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 8 April
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- General Organic Chemistry
JEE Main 2026 · 8 April · Evening Shift · Chemistry · General Organic Chemistry
Given below are two statements: Statement I: Vapours of the liquid...
Given below are two statements:
Statement I: Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation.
Statement II: The vapours rising up in the fractionating column become richer in high boiling component of the mixture.
In the light of the above statements, choose the correct answer from the options given below:
Statement I: Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation.
Statement II: The vapours rising up in the fractionating column become richer in high boiling component of the mixture.
In the light of the above statements, choose the correct answer from the options given below:
Options
- ABoth Statement I and Statement II are true
- BBoth Statement I and Statement II are false
- CStatement I is true but Statement II is false
- DStatement I is false but Statement II is true
Correct answer
C. Statement I is true but Statement II is false
Step-by-step solution
In fractional distillation, the temperature of the fractionating column decreases from bottom to top. As the vapours of the mixture rise, they cool and undergo condensation.
The component with the higher boiling point condenses at a higher temperature, meaning it condenses earlier (lower down the column) than the component with the lower boiling point. Thus, Statement I is true.
As the vapours rise up the fractionating column, the higher boiling component continuously condenses and falls back as liquid, while the lower boiling (more volatile) component remains in the vapour phase and continues to rise. Therefore, the vapours rising up the column become richer in the lower boiling component, not the high boiling component. Thus, Statement II is false.
Hence, Statement I is true but Statement II is false.
Answer: Statement I is true but Statement II is false
The component with the higher boiling point condenses at a higher temperature, meaning it condenses earlier (lower down the column) than the component with the lower boiling point. Thus, Statement I is true.
As the vapours rise up the fractionating column, the higher boiling component continuously condenses and falls back as liquid, while the lower boiling (more volatile) component remains in the vapour phase and continues to rise. Therefore, the vapours rising up the column become richer in the lower boiling component, not the high boiling component. Thus, Statement II is false.
Hence, Statement I is true but Statement II is false.
Answer: Statement I is true but Statement II is false