Question

Write chemical equation of combustion reaction for hexyne.

Answer 1

Hint: We know that combustion is also known as burning. Combustion occurs at high temperature and is an exothermic reaction. Hexyne is a hydrocarbon. All hydrocarbons on combustion produce carbon dioxide and water. Thus, hexyne on combustion produces carbon dioxide and water.

Complete step by step solution:
Combustion reaction occurs when hydrocarbon reacts with oxygen. During a combustion reaction, heat is released. Thus, the combustion reaction is an exothermic reaction.
Hydrocarbons on heating in presence of air get completely oxidised to carbon dioxide and water. Hydrocarbons burn with a non-luminous or sooty flame.
We know that hexyne is an alkyne (hydrocarbon) having molecular formula ${{\text{C}}_{\text{6}}}{{\text{H}}_{{\text{10}}}}$. Thus, hexyne burns in presence of oxygen to form carbon dioxide and water.
The combustion reaction of hexyne is as follows:
${\text{2}}{{\text{C}}_{\text{6}}}{{\text{H}}_{{\text{10}}}}\left( {\text{g}} \right) + {\text{17}}{{\text{O}}_{\text{2}}}\left( {\text{g}} \right)\xrightarrow{{{\text{Heat}}}}{\text{12C}}{{\text{O}}_{\text{2}}}\left( {\text{g}} \right) + {\text{10}}{{\text{H}}_{\text{2}}}{\text{O}}\left( {\text{g}} \right)$
Heat is generated in the reaction. Thus, combustion of hexyne is an exothermic reaction. Generally, all combustion reactions are exothermic in nature.
As a large amount of heat is released during the combustion of hexyne, hexyne is used as a fuel.
Combustion of hexyne is a combustion as well as oxidation reaction. All the combustion reactions are oxidation reactions but all oxidation reactions are not combustion reactions.
If complete combustion of hydrocarbon does not occur, it results in production of carbon black. Incomplete combustion reaction occurs because of insufficient amount of oxygen. The carbon black produced is used for manufacturing inks, printer inks, black pigments and filters.

Note:
Hexyne is an odourless hydrocarbon. It is highly flammable in nature. It is a colourless gas in appearance. Hexyne can be liquefied easily.