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  Chemistry (NTSE/Olympiad)  

6. Carbon and Its Compound

Chemical Properties of Carbon Compounds

Chemical Properties of Carbon Compounds
64. Combustion of Carbon: Carbon, in all allotropic forms, burns in presence of oxygen to form carbon dioxide with evolution of heat and light energy. In case of diamond, graphite and fullerene, they burn completely to form CO2 because they are purest form of carbon.
C + O2 → CO2 + Heat + light
Most of the carbon compounds are combustible and burn in presence of oxygen to form CO2 and H2O. e.g.,
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) + heat + light
2H2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l) + Heat + light
2CH3OH(g) + 3O2(g) → 2CO2(g) + 4H2O(l) + heat light
CH3CH2OH(l) + 3O2 → 2CO2(g) + 3H2O(l) + heat
CH3COOH (l) + 2O2(g) → 2CO2(g) + 2H2O(l) + heat
65. Combustion of Hydrocarbons : If hydrocarbons are burnt in limited supply of oxygen then smoky flame is produced due to incomplete combustion whereas in excess of oxygen, complete combustion takes place and non-luminous bluish flame with high temperature is produced.
66. Oxidising Agent : Those substances which can add oxygen to starting material are called oxidising agents, e.g., alkaline KMnO4 and acidified potassium dichromate
75. Combustion of Acetylene : Acetylene burns in presence of oxygen to form CO2 and H2O.

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