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PCH 204University of IbadanSep 27, 2026

Hydrocarbons: Alkanes, Aliphatic & Aromatic Compounds

Structure

10 Concept Stages

Practice Exam

77+ Questions

Active Recall

Exam-Matched

Executive Topic Summary

Master the foundational chemistry of hydrocarbons—pure carbon and hydrogen compounds that form the backbone of organic chemistry. Learn how alkanes are structured, how they rotate and conform, why some are more stable than others, and how their combustion impacts our planet. Explore the environmental crisis of CFCs and the greener alternatives (HFAs and HFOs) being developed today.

High-Yield Exam Takeaways

Hydrocarbons: The Big Picture Classification
Alkanes: Structure, Bonding & Hybridization
Conformations & Rotations: How Alkanes Twist
Homologous Series & Alkane Nomenclature
Types of Carbon Atoms: Primary, Secondary, Tertiary, Quaternary
Combustion of Alkanes: Energy, Pollution & Climate
Cycloalkanes: Rings Without Aromatic Resonance
CFCs, HFAs & HFOs: The Propellant Evolution & Environmental Crisis
Aromatic Hydrocarbons: Benzene & Resonance Stabilization
Summary: Hydrocarbons in Context & Real-World Applications

Study Tree Preview (Bite-Sized Concepts)

Previewing 3 stages

1Hydrocarbons: The Big Picture Classification

4 Micro-Bites

What Are Hydrocarbons? The Simplest Organic Molecules:A <term def="any molecule made up of only carbon and hydrogen atoms bonded together">hydrocarbon</term> is literally just carbon and hydrogen atoms linked by covalent bonds. No oxy...

The Two Main Families: Aliphatic vs Aromatic:All hydrocarbons split into two major families. **Aliphatic hydrocarbons** are open-chain or simple ring structures with no special resonance magic—they're the "normal" hydrocarbon...

2Alkanes: Structure, Bonding & Hybridization

2 Micro-Bites

The Tetrahedral Carbon: Why Alkanes Are 3D Molecules:Here's a critical insight: every carbon atom in an alkane is <term def="bonded to four other atoms arranged in a three-dimensional pyramid shape with 109.5° angles">tetrahedral</te...

Sigma Bonds: The Workhorse Single Bonds:Every C–C and C–H bond in an alkane is a <term def="a covalent bond formed by direct overlap of atomic orbitals along the internuclear axis, allowing free rotation">sigma bond (σ b...

3Conformations & Rotations: How Alkanes Twist

4 Micro-Bites

Conformations: Different 3D Shapes Without Breaking Bonds:Here's something crucial: <term def="different spatial arrangements of atoms that can be interconverted by rotation around single bonds without breaking any bonds">conformations</t...

Eclipsed vs Staggered: The Two Main Conformations:When you rotate ethane around its C–C bond, you encounter two extreme conformations: **Eclipsed Conformation**: The hydrogens on the front carbon line up directly behind the hydro...

Sample Practice Questions (Active Recall)

Showing 3 of 77+

Q1.Which of the following best explains the fundamental difference between aliphatic and aromatic hydrocarbons?

AAliphatic hydrocarbons contain only single bonds, while aromatic hydrocarbons contain double bonds.

BAliphatic hydrocarbons are always cyclic, while aromatic hydrocarbons are always linear.

CAromatic hydrocarbons possess delocalized π electrons providing resonance stabilization, which aliphatic hydrocarbons lack.

DThe molecular formula for aliphatic hydrocarbons is always C_nH_{2n+2}, while for aromatic it is C_nH_{2n-6}.

Q2.All hydrocarbons that contain a ring structure are classified as aromatic hydrocarbons.

ATrue

BFalse

Q3.Within the aliphatic family, a hydrocarbon with at least one carbon-carbon triple bond is classified as an ______.

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