Question

Which one of the following compounds is not formed in the 'catalytic cracking' of octane?
A. Pentane
B. Butene
C. Propene
D. Hydrogen gas

Answer 1

The process of converting higher hydrocarbons to lower hydrocarbons with the help of the catalyst is called catalytic cracking. Long chain hydrocarbons are going to convert into lower hydrocarbons in the process of cracking.

Complete answer:
- In the question it is asked to find the compounds which are not formed in the 'catalytic cracking' of octane from the given options.
- We know that octane is the organic hydrocarbon which is going to have eight carbon atoms in its structure.
- We have to find the molecule which is not going to be formed in the cracking process.
- In the cracking process of octane, the compounds or lower hydrocarbons which are going to be formed are pentane, butene, and propene.
- Means hydrogen gas is not going to be formed during the process of the cracking of the octane.
- There is no chance to get the free hydrogen gas during cracking.
- Means among the given options hydrogen gas is not going to be formed during the cracking of the octane.

Therefore, the correct option is D.

Note:
During cracking there is a requirement of the higher temperatures to break the longer hydrocarbons to less carbon containing compounds. There is a need for a catalyst too to do the process of converting longer chains to less carbon containing compounds.