Which is the structural formula for propane?

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Study for the IGCSE Organic Chemistry Test. Engage with flashcards and multiple-choice questions, complete with hints and detailed explanations. Prepare effectively to excel in your exam!

Multiple Choice

Which is the structural formula for propane?

Explanation:
Propane is an alkane with three carbon atoms in a row and eight hydrogens. Its structural (condensed) formula shows three carbons linked together, with the end carbons bearing three hydrogens and the middle carbon bearing two hydrogens: CH3-CH2-CH3. This pattern matches C3H8, which is propane. The other options don’t fit: CH4 is methane (one carbon); CH3-CH3 would be ethane (two carbons); CH3-CH2-CH2-CH3 has four carbons, which is butane. So CH3-CH2-CH3 is the correct representation.

Propane is an alkane with three carbon atoms in a row and eight hydrogens. Its structural (condensed) formula shows three carbons linked together, with the end carbons bearing three hydrogens and the middle carbon bearing two hydrogens: CH3-CH2-CH3. This pattern matches C3H8, which is propane.

The other options don’t fit: CH4 is methane (one carbon); CH3-CH3 would be ethane (two carbons); CH3-CH2-CH2-CH3 has four carbons, which is butane. So CH3-CH2-CH3 is the correct representation.

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