Question

…………is the breaking down of long chain hydrocarbons into smaller molecules.

• A. Decomposition
• B. Catenation
• C. Cracking
• D. Combustion

Hint:

Cracking improves fuel quality by producing smaller hydrocarbons like petrol and LPG.

Answer 1

The Correct Option is C

Step 1: Understanding the process.
Cracking is a process in petroleum refining where high molecular weight hydrocarbons (long chains) are broken into smaller, more useful hydrocarbons.
Step 2: Types of cracking.
- Thermal cracking (heat).
- Catalytic cracking (using zeolite catalysts).
Step 3: Eliminate other options.
- Decomposition: general breakdown, not specific to hydrocarbons.
- Catenation: ability of atoms (like carbon) to form chains.
- Combustion: reaction with oxygen giving \(CO_2\) and \(H_2O\).
Thus, the correct answer is Cracking.
Final Answer: \[ \boxed{\text{Cracking}} \]