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WAEC Chemistry 2014 Paper

Question : 34

Total: 45

Which type of reaction is illustrated by the following equation? C₁₂H₂₆ → 5C ₂H₄ + C ₂H₆

Solution:

Concept:

Breaking a large hydrocarbon into smaller hydrocarbons is called cracking.

Explanation:

The equation shows a large alkane molecule,

\mathrm{C}_{12}\mathrm{H}_{26}

, breaking down into smaller molecules.

It produces ethene,

\mathrm{C}_2\mathrm{H}_4

, and ethane,

\mathrm{C}_2\mathrm{H}_6

This process converts a bigger hydrocarbon into smaller, more useful ones.

Therefore, this reaction is a typical example of cracking.

Answer:

B. Cracking

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