Propane burns in air to produce carbon dioxide and water. what is this type of chemical reaction called?
synthesis
combustion
decomposition
single replacement

combustion

Explanation:

1. Synthesis is a chemical reaction in which two or more reactants combine to give a single product.

2. Combustion is a chemical reaction in which hydrocarbon burns in the presence of oxygen to form carbon dioxide, water and energy.

2. Decomposition reaction is a chemical reaction in which one reactant gives two or more than two products on absorption of energy.

4. A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be