Draw the electron-dot structure for ethyne. $A$ mixture of ethyne and oxygen is burnt for welding. In your opinion,why cannot we use a mixture of ethyne and air for this purpose?

(N/A) The electron-dot structure of ethyne $(C_2H_2)$ shows a triple bond between the two carbon atoms and a single bond between each carbon and hydrogen atom.
In pure oxygen,ethyne undergoes complete combustion,which releases a large amount of heat,attaining the high temperature required for welding.
In contrast,air contains a lower percentage of oxygen compared to pure oxygen. When ethyne is burnt in air,it undergoes incomplete combustion,which produces a sooty flame and does not generate the high temperature necessary for welding.