CCH32CH2CH3

The chemical formula CCH3CH2CH3 represents propyne, also known as methylacetylene. It is an alkyne with the chemical formula C3H4. Propyne is a colorless gas at room temperature and pressure. It is an isomer of allene (propadiene). Propyne is a highly flammable substance and has a pungent odor.

Propyne is a linear molecule with a triple bond between the first and second carbon atoms. The central carbon atom is sp hybridized, and the terminal carbon atoms are sp hybridized. The molecule is linear around the triple bond.

Propyne can be synthesized through various methods. One common method involves the dehydrohalogenation of 1,2-dihalopropanes or 2,2-dihalopropanes using a strong base. It can also be produced as a byproduct in certain industrial processes, such as steam cracking of hydrocarbons.

Industrially, propyne is often found as a component of a mixture with propadiene, known as MAPP gas (methylacetylene-propadiene). MAPP gas is used as a fuel gas for welding and cutting metals due to its high flame temperature. Propyne itself can undergo various chemical reactions characteristic of alkynes, including addition reactions across the triple bond. These reactions can lead to the formation of alkenes and alkanes, or the addition of halogens, hydrogen halides, and water.