Question

# The reaction ${C_{12}}{H_{26}} \to {C_6}{H_{12}} + {C_6}{H_{14}}$ represents:A.SubstitutionB.SynthesisC.CrackingD.polymerisation

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Hint:
In the above reaction given, the reactant is broken down into two simpler organic compounds.

After understanding the above descriptions and observing the reaction at hand, we can say that a complex organic compound, i.e. ${C_{12}}{H_{26}}$ breaks down into 2 simpler organic compounds.
Hence the reaction ${C_{12}}{H_{26}} \to {C_6}{H_{12}} + {C_6}{H_{14}}$ represents cracking.