Formation of Methane Oxy acetylene welding Acetylene burned in this torch produces a flamehot enough to melt iron
The hydrocarbons in which each carbon atom is bonded to fourneighboring atoms by four single covalent bonds areknown as saturated hydrocarbons. The term saturatedmeans that each carbon has as many atoms bonded to it as possible. Eg:Methane , Ethane, etc.
A hydrocarbon containing a multiple bond, either double or triple isknown as an unsaturated hydrocarbon. Because of themultiple bond, two of the carbons are bonded to fewer than four otheratoms. These carbons are thus said to be unsaturated . Eg: Ethene,acetylene, etc.
Acetylene, C2H2 is an unsaturated hydrocarboncontaining a triple bond. A confined flame of acetylene burning in oxygen(oxy acetylene) is hot enough to melt iron, which makesacetylene a choice fuel for the welding.
In a saturated hydrocarbon, all the carbon atoms are bonded to fourother atoms whereas in an unsaturated hydrocarbon, some of the carbon atoms may only be bonded to three ortwo other atoms. The number of atoms bonded to each of the two middlecarbons of n – butane is four, whereas each of the two middle carbons of2 – butene is bonded to three other atoms i.e., a hydrogen and twocarbons.