What is the Difference Between Ethanal and Propanal?

Ethanal and propanal are both aldehyde compounds, but they differ in the number of carbon atoms present in their molecules, which results in different chemical and physical properties. The main differences between ethanal and propanal are:

1. Number of carbon atoms: Ethanal has two carbon atoms, while propanal has three carbon atoms in its molecule.
2. Chemical formula: Ethanal's chemical formula is CH3CHO, while propanal's chemical formula is CH3CH2CHO.
3. Iodoform test: Ethanal responds to the iodoform test, forming a yellow precipitate of iodoform with an alkaline solution of NaOH. In contrast, propanal does not respond to the iodoform test.
4. Odor: Ethanal has an ethereal odor, while propanal has a fruity and pungent odor.
5. Melting and boiling points: Ethanal has a melting point of -123.37°C and a boiling point of 20.0°C. Propanal's melting and boiling points are not provided in the search results, but they are likely different from ethanal's.
6. Miscibility: Ethanal is miscible with water, ethanol, ether, benzene, and toluene. Propanal's miscibility is not mentioned in the search results, but it is likely similar to ethanal's.
7. Molecular geometry: Ethanal has a trigonal planar geometry around the carbonyl carbon atom and a tetrahedral geometry around the other carbon atom. Propanal's molecular geometry is not provided in the search results, but it is likely similar to ethanal's.

Comparative Table: Ethanal vs Propanal

Here is a table comparing the differences between ethanal and propanal:

Ethanal and propanal are both aldehyde compounds, but they differ in the number of carbon atoms present in their molecules. Ethanal has an ethereal odor, while propanal has a slightly fruity odor. The best way to distinguish between ethanal and propanal is by using the iodoform test, where ethanal responds by forming a yellow precipitate (CHI3), while propanal does not respond to the test.