The carbon atoms are bonded together by one sigma bond and two pi bonds. The pi bonds are not localized and hence these hydrocarbons are unsaturated.
Alkynes are more reactive than their alkene and alkane counterparts.
Its molecular formula is C 2 H 2 . We shall study the preparation, properties of this simplest of the alkynes. The properties of others would be similar as they belong to the homologous group. Ethyne is known commonly as acetylene. Ethyne Ethyne is a colourless and tasteless gas at ordinary room temperatures.