Q106 / 180 · NEET 2026 (Cancelled) · Chemistry
Mixture of chloroform and acetone forms a solution with negative deviation from Raoult's law due to :
- Aincrease in escaping tendency of molecules of each component.
- Correct answerBformation of hydrogen bonding between acetone and chloroform.
- Cstronger intermolecular forces between chloroform molecules than those between chloroform and acetone molecules.
- Drepulsive forces.
Solution
Chloroform ($CHCl_3$) and acetone ($CH_3COCH_3$) form a non-ideal solution showing a negative deviation from Raoult's law.
This is because the hydrogen atom of chloroform forms a hydrogen bond with the oxygen atom of acetone.
The formation of this intermolecular hydrogen bond makes the attractive forces between the unlike molecules stronger than the attractive forces between the like molecules.
As a result, the escaping tendency of the molecules from the liquid phase decreases, leading to a lower vapour pressure than expected from Raoult's law.
Answer: formation of hydrogen bonding between acetone and chloroform.
This is because the hydrogen atom of chloroform forms a hydrogen bond with the oxygen atom of acetone.
The formation of this intermolecular hydrogen bond makes the attractive forces between the unlike molecules stronger than the attractive forces between the like molecules.
As a result, the escaping tendency of the molecules from the liquid phase decreases, leading to a lower vapour pressure than expected from Raoult's law.
Answer: formation of hydrogen bonding between acetone and chloroform.
Hence, the correct answer is option: 'B'.