2
Explanation:
Organic compounds are those compounds that contain carbon bonded to hydrogen.
Inorganic compounds are those compounds that do not contain carbon or contain carbon not bonded to hydrogen.
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Combustion is a chemical reaction in which organic compound is reacted with oxygen to form carbon dioxide and water.
2.
This is combustion of inorganic compound in which it is reacted with oxygen and is called as synthesis reaction.
3.
Double displacement is a chemical reaction in which exchange of ions take place.
4.
Combustion is a chemical reaction in which organic substance is reacted with oxygen to form carbon dioxide and water.