Physical Properties

Properties

The first three alkynes are gases while those containing five to thirteen carbon atoms are liquids and higher alkynes are solids. Hybridization due to triple bonds allows the uniqueness of alkyne structure. This triple bond contributes to the nonpolar bonding strength, linear, and the acidity of alkynes.

Physical Properties

· Physical state, colour, smell, etc: The first three members of the family,i.e., ethane,propene and butenes are colourness gases ; the next fourteen members (C₅-C₁₈) are liquid while the higher ones are solids.

· Solubility: They are insoluble in water, but are fairly soluble in non-polar solvents such as beneze,petroleum ether,etc.

· Boiling points: Their boiling points increases regularly with increases in molecular mass. On the average, the boiling points generally increases by 20-30 K for the addition of each CH₂ group to the chain.