Write chemical equations for the combustion reaction of the following hydrocarbons:
$(i)$ Butane $(ii)$ Pentene $(iii)$ Hexyne $(iv)$ Toluene

Combustion is the reaction of a hydrocarbon with oxygen to produce carbon dioxide,water,and heat.
$(i)$ $2C_4H_{10(g)} + 13O_{2(g)} \to 8CO_{2(g)} + 10H_2O_{(g)} + \text{Heat}$
$(ii)$ $2C_5H_{10(g)} + 15O_{2(g)} \to 10CO_{2(g)} + 10H_2O_{(g)} + \text{Heat}$
$(iii)$ $2C_6H_{10(g)} + 17O_{2(g)} \to 12CO_{2(g)} + 10H_2O_{(g)} + \text{Heat}$
$(iv)$ $C_6H_5CH_{3(l)} + 9O_{2(g)} \to 7CO_{2(g)} + 4H_2O_{(g)} + \text{Heat}$