30. M/J 2015/P12/Q36, M/J 2015/P11/Q35
When cracked, one mole of a compound, X, produces one mole of propene and one mole of hydrogen.
X → C3H6 + H2
What type of compound is X?
A an alcohol
B an alkane
C an alkene
D a carboxylic acid
Answer: B
Explaination
Cracking converts saturated hydrocarbon into unsaturated hydrocarbon (alkene).
For example, cracking large HC hexane, it becomes smaller alkene molecule. The products obtained in cracking are alkene always and H2 gas may also be produced.
The complete equation will be
C3H8 → C3H6 + H2
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