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Chemistry

Alkanes, Alkenes, and Alkynes

IUPAC Naming, Sigma and Pi Bonds, and the Logic of Structural Isomers — A TLDR Primer

Organic chemistry trips up a lot of students at the same point: the moment carbon bonding, IUPAC naming rules, and molecular geometry all land at once. If you have a test on hydrocarbons coming up — or you're starting intro or AP-level organic chemistry and want to get your footing fast — this guide cuts straight to what you need.

**TLDR: Alkanes, Alkenes, and Alkynes** covers the three core families of simple hydrocarbons from the ground up. You'll learn why carbon forms the backbone of so much chemistry, how to read and draw Lewis, condensed, and skeletal structures, and how to apply IUPAC naming rules to alkanes, alkenes, and alkynes — including substituents, locants, and the lowest-locant rule. The guide explains hybridization and molecular geometry in plain language, walks through structural and cis/trans isomerism, and covers the must-know reactions: combustion, free-radical halogenation, and addition reactions.

This is a high school organic chemistry study guide written for students in grades 9–12 and early college. It assumes you know basic atomic structure and can read a periodic table — nothing more. Every term is defined on first use, every concept is shown with worked numbers, and common misconceptions are called out and corrected inline.

Short by design, with no filler and no review of things you already know. For students who also want IUPAC naming hydrocarbons practice, the worked examples throughout the guide give you models you can apply immediately.

If hydrocarbons are on your next exam, pick this up and read it today.

What you'll learn
  • Distinguish alkanes, alkenes, and alkynes by bonding, geometry, and general formula
  • Draw and interpret structural, condensed, and skeletal formulas
  • Apply IUPAC rules to name straight-chain, branched, and unsaturated hydrocarbons
  • Identify structural isomers and cis/trans (E/Z) isomers
  • Predict the products of combustion, halogenation, addition, and hydrogenation reactions
  • Connect hydrocarbon chemistry to fuels, plastics, and everyday materials
What's inside
  1. 1. What Hydrocarbons Are and Why Carbon Is Special
    Introduces hydrocarbons, the three families, and the bonding rules that make carbon chemistry possible.
  2. 2. Drawing Structures: Lewis, Condensed, and Skeletal Formulas
    Teaches the three ways chemists represent hydrocarbons and how to convert between them.
  3. 3. IUPAC Naming Rules for Alkanes, Alkenes, and Alkynes
    Walks through the systematic naming procedure, including substituents, locants, and the lowest-locant rule.
  4. 4. Shape, Geometry, and Isomerism
    Connects hybridization to molecular geometry and explains structural and cis/trans isomerism.
  5. 5. Core Reactions: Combustion, Substitution, and Addition
    Covers the must-know reactions: combustion of alkanes, halogenation, and addition reactions of alkenes and alkynes.
  6. 6. Why It Matters: Fuels, Plastics, and the Path Forward
    Connects hydrocarbon chemistry to gasoline, polymers, and the organic chemistry topics that come next.
Published by Solid State Press
Alkanes, Alkenes, and Alkynes cover
TLDR STUDY GUIDES

Alkanes, Alkenes, and Alkynes

IUPAC Naming, Sigma and Pi Bonds, and the Logic of Structural Isomers — A TLDR Primer
Solid State Press

Alkanes, Alkenes, and Alkynes

IUPAC Naming, Sigma and Pi Bonds, and the Logic of Structural Isomers — A TLDR Primer

Copyright © 2026 Solid State Press.

Published by Solid State Press.

All rights reserved. No part of this book may be reproduced or transmitted in any form without prior written permission, except for brief quotations in critical reviews and educational use.

Part of the TLDR Study Guides series.

Contents

  1. 1 What Hydrocarbons Are and Why Carbon Is Special
  2. 2 Drawing Structures: Lewis, Condensed, and Skeletal Formulas
  3. 3 IUPAC Naming Rules for Alkanes, Alkenes, and Alkynes
  4. 4 Shape, Geometry, and Isomerism
  5. 5 Core Reactions: Combustion, Substitution, and Addition
  6. 6 Why It Matters: Fuels, Plastics, and the Path Forward
Chapter 1

What Hydrocarbons Are and Why Carbon Is Special

Carbon sits at the center of an enormous amount of chemistry because of one structural fact: it can form four stable bonds at once, in almost any combination, and chain those bonds together almost without limit.

Hydrocarbons are compounds made of only hydrogen and carbon. That sounds like a narrow category, but it contains gasoline, natural gas, candle wax, polyethylene bags, and the backbone of every drug and protein your body has ever processed. The rest of organic chemistry builds on top of hydrocarbon structure, so understanding this foundation is not optional — it is the first domino.

Carbon's Bonding Rules

Carbon has four electrons available for bonding — chemists call this being tetravalent (from the Greek tetra-, "four," and the Latin valentia, "strength" or "capacity"). Every stable organic molecule obeys a simple rule: each carbon forms exactly four bonds. Hydrogen forms exactly one. When you see a structure that violates those counts, something is wrong.

Those four bonds can be distributed in three ways:

  • Four single bonds (no multiple bonds)
  • One double bond and two single bonds
  • One triple bond and one single bond

Each single bond between two atoms is a sigma bond ($\sigma$ bond) — a direct, head-on overlap of electron orbitals along the line connecting the two nuclei. Head-on overlap is more effective than sideways overlap, making a sigma bond stronger than a pi bond, and atoms can rotate around it freely.

A double bond consists of one sigma bond plus one pi bond ($\pi$ bond). A pi bond forms from the sideways overlap of parallel orbitals above and below the bond axis. That sideways overlap is weaker than a sigma overlap, and critically, it locks the two bonded atoms in place — rotation around a double bond is restricted. This restriction is what makes the cis/trans geometric differences you will meet in Section 4 possible.

A triple bond is one sigma bond plus two pi bonds. The two atoms are held even more tightly together and the region around the bond is completely cylindrical.

The Three Families

About This Book

If you are a high school student working through a high school organic chemistry study guide for the first time, preparing for an AP Chemistry exam, or sitting in an intro organic chem course wondering why carbon behaves the way it does, this book was written for you. It also works for parents helping a student review before a test and for tutors who need a clean, fast reference.

This primer covers everything in the organic chemistry alkanes alkenes alkynes guide space that a student actually needs: understanding carbon bonding for beginners, drawing Lewis and skeletal structures, IUPAC naming hydrocarbons practice, geometric and structural isomers, and the core hydrocarbon reactions — combustion, free-radical substitution, and addition. A quick guide to hydrocarbon structure naming is threaded through every section. A concise overview with no filler.

Read straight through once to build the full picture. Work every numbered example as you go, then attempt the problem set at the end to find the gaps.

Keep reading

You've read the first half of Chapter 1. The complete book covers 6 chapters in roughly fifteen pages — readable in one sitting.

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