What is the displayed formula for propanol?

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Prepare for the IGCSE Organic Chemistry Exam. Study with flashcards and multiple choice questions, each question has hints and explanations to ensure you understand the core concepts. Get ready for your test with confidence!

Multiple Choice

What is the displayed formula for propanol?

Explanation:
Propanol is an alcohol with three carbon atoms, so its formula is C3H8O. A displayed (structural) formula shows how the atoms are arranged and where the OH group sits. Writing C3H7OH explicitly shows three carbons, seven hydrogens attached to the carbon skeleton, and the OH group, which together reflect the presence of the hydroxyl function and the full hydrogen count. This form communicates both the carbon chain and the alcohol group in a compact way. The other options either give only the molecular formula (which doesn’t show the arrangement) or miss a hydrogen (C3H7O), so they don’t represent propanol correctly.

Propanol is an alcohol with three carbon atoms, so its formula is C3H8O. A displayed (structural) formula shows how the atoms are arranged and where the OH group sits. Writing C3H7OH explicitly shows three carbons, seven hydrogens attached to the carbon skeleton, and the OH group, which together reflect the presence of the hydroxyl function and the full hydrogen count. This form communicates both the carbon chain and the alcohol group in a compact way. The other options either give only the molecular formula (which doesn’t show the arrangement) or miss a hydrogen (C3H7O), so they don’t represent propanol correctly.

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