- Books Name
- ACME SMART COACHING Chemistry Book
- Publication
- ACME SMART PUBLICATION
- Course
- CBSE Class 12
- Subject
- Chemistry
Physical properties of Aldehydes and Ketones
Physical properties of Aldehydes and Ketones :
- Methanal - Gas at room temperature
- Ethanal - Volatile liquid
- Other aldehydes and ketones - Liquid or solid at room temperature
- Boling points of aldehydes and ketones are higher than those of hydrocarbons and ethers of comparable molecular masses.
Reason : Weak molecular association in aldehydes and ketones, arising out of the dipole-dipole interactions
- Boiling points of aldehydes and ketones are lower than those of alcohols of similar molecular masses.
Reason : Absence of intermolecular hydrogen bonding
- Lower members of aldehydes and ketones are miscible with water in all proportions.
Reason : They form hydrogen bonds with water.
- Solubility of aldehydes and ketones decreases rapidly on increasing the length of the alkyl chain.
- All aldehydes and ketones are fairly soluble in organic solvents such as ether, methanol, etc.
- Lower aldehydes have sharp pungent odours.
- As the size of aldehydes increases, the odour becomes less pungent and more fragrant.