Explanation: Burning of an alkane in the presence of air is called combustion
CH4 + 2O2 → CO2 + 2H2O + 891 Kj/mol
This reaction involves formation of CO2 so it is an exothermic reaction. However this reaction requires high energy to start. For this peupose spark or flame is used. Combustion occurs in automobile engines for their smooth internel combustion
Q: Which element of group IV-A does not use d-orbital?