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The chemical reaction that is accountable for making more than two products from one reactant only is called a decomposition reaction.

Several factors like heat (thermal decomposition), light (photochemical decomposition), and electricity (electrical decomposition) initiate these decomposition chemical reactions.

Acetylene is thermodynamically unstable; therefore, it decomposes into its elements when kept at $1500{\text{ }}^{\mathrm{o}}\mathrm{C}$for too long.

The decomposition reaction of acetylene is exothermic $\left({\text{Δ±á}}^{\text{0}}\text{=-234 k´³/³¾´Ç±ô}\right)$, and entropy also increases, which will affect $\mathrm{Δ}G$(Gibbs free energy). At $1500{\text{ }}^{\mathrm{o}}\mathrm{C}$kinetically, all activation energy barriers will be overcome.

The decomposition reaction of acetylene at $\text{1500 }{}^{\text{ο}}\text{C}$is represented as: