What kind of chemical reactions are the following equations:
1) CH4 + O2 gives CO2 + H2O
2) C6H12O6 + O2 gives CO2 + H2O + energy 
i) Combination and Exothermic , ii) Decomposition and Exothermic , iii) Displacement and Exothermic , iv) Oxidation and Exothermic v) Reduction and Exothermic 

Dear student

The reaction in which two reactants combine to give new products is called combination reaction.
The reaction in which energy is released is called exothermic reaction.
Hence reaction (1) is combination and reaction (2) is exothermic.
Option (i) is correct

Regards

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