Question

what is the product in pyrolysis reaction of n-Decane

Answer 1

Pyrolysis is degradation of large hydrocarbon molecules into smaller, simple hydrocarbons in the presence of high temperature. It is not a unique reaction and number of reactions take place in the chamber resulting of which random products are formed.
Decane can possibly break into :
- C₁₀H₂₂ → H₂C=CH-CH₃ + C₇H₉
decane propene hexane

- C₁₀H₂₂ → H₂C=CH₂ + C₈H₁₀
decane ethene octane