Question

Which of the following mixtures could not form when octane, C3H18, is cracked?

Answer 1

Answer:

Hydrogen Gas

Explanation:

During pyrolysis or catalytic cracking of alkanes, on strong heating at high temperature, in absence of air, higher alkanes split into lower alkanes, alkenes and hydrogen.  

 

R−H  

Heat

absence of oxygen

​

(lower alkane)R−H+(alkene)R=R+H  

2

​

 

However during catalytic cracking of octane, hydrogen gas is not obtained. Pentane, butane and propene are obtained.

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