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Learn Organic Chemistry

Stop memorizing reactions and start predicting where the electrons go.

Free to start. Built from a single prompt. No credit card.

Organic chemistry is the chemistry of carbon compounds, the molecules behind fuels, plastics, medicines and every living cell. Carbon forms four stable bonds and links into chains and rings, so the number of possible structures is enormous, but their behavior follows a small set of patterns. Once you can read skeletal structures, recognize functional groups and draw curved arrows showing electrons moving, most reactions become predictable rather than memorized. Learnr builds a personalized organic chemistry course from a single prompt and teaches it in short lessons with mechanism practice that adapts to you.

How to learn Organic Chemistry, step by step

Refresh general chemistry bonding first. Review Lewis structures, formal charge, electronegativity, resonance and sp, sp2 and sp3 hybridization. Draw the resonance forms of the carboxylate ion and an amide until you can see why the charge or lone pair is spread out.
Learn to read and draw skeletal structures. In line-angle drawings every vertex and line end is a carbon and hydrogens are implied. Convert molecules between condensed, Lewis and skeletal forms and count the hidden hydrogens until you can do it at a glance.
Memorize the functional groups and naming rules. Know alkenes, alcohols, ethers, amines, aldehydes, ketones, carboxylic acids, esters and amides on sight. Then practice IUPAC naming: find the longest chain containing the main group, number for the lowest locants and alphabetize substituents.
Master acid-base reasoning and arrow pushing. Arrows always start at electrons, a lone pair or a bond, and point to where they go. Use a short pKa table and conjugate base stability (charge on which atom, resonance, induction, orbital) to predict which way acid-base equilibria lie.
Study stereochemistry with a model kit. Build molecules to see chirality, assign Cahn-Ingold-Prelog priorities for R and S, and spot meso compounds. Practice Newman projections and cyclohexane chair flips, tracking which groups sit axial and equatorial.
Learn mechanisms, then build a reaction map. Understand SN2 backside attack with inversion, SN1 and E1 carbocations with rearrangements, and E2 anti-periplanar elimination. Then connect reactions on one sheet showing how each functional group converts to others, and use it for multistep synthesis problems.
Drill reagents and mechanisms a little every day. Organic chemistry piles up fast, and cramming fails. Short daily Learnr sets on reagents, products and arrow-pushing, kept going with a streak, hold earlier reactions in memory while you add new ones.

What you'll learn

Draw skeletal structures and name compounds with IUPAC rules
Identify functional groups and predict how each tends to react
Push curved arrows to show electron flow in reaction mechanisms
Choose between SN1, SN2, E1 and E2 pathways for a given substrate
Assign R and S configurations and tell enantiomers from diastereomers

What's inside your Organic Chemistry course

A sample path Learnr builds for Organic Chemistry. Your real course adapts to your goal and level.

1. Bonding, hybridization and drawing structures
2. Functional groups and nomenclature
3. Conformations and stereochemistry
4. Acids, bases and the logic of mechanisms
5. Substitution and elimination reactions
6. Alkenes, alcohols and carbonyl chemistry

How long does it take to learn Organic Chemistry?

A standard college organic sequence runs two semesters. Self-studying the first half (structure, stereochemistry, substitution, elimination and alkenes) usually takes 3 to 4 months at 6 to 8 hours a week. Strong general chemistry shortens that, and aiming for synthesis and spectroscopy adds several more months.

What you need before you start

General chemistry: atomic structure, Lewis structures, electronegativity, bonding and molecular shape, acids and bases, and equilibrium. Very little math is needed beyond basic algebra.

Common mistakes to avoid

Memorizing every reaction as an isolated fact. Learn why nucleophiles attack electrophiles and most reactions follow from a few mechanism patterns.
Drawing curved arrows from atoms or positive charges instead of from electrons, which produces impossible mechanisms and wrong products.
Working only on flat paper and never building models, which makes chirality, chair conformations and anti-periplanar geometry far harder to see.

How Learnr builds your course

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Organic Chemistry questions, answered

Why does organic chemistry have a reputation for being so hard?

The volume of reactions is large and each topic builds on the last, so falling behind compounds quickly. Learning mechanisms and reviewing daily turns it from memorization into pattern recognition.

Is organic chemistry mostly memorization?

Less than it seems. You do need functional groups and some reagents memorized, but mechanisms explain most reactions, so understanding electron flow lets you predict products you have never seen.

Do I need general chemistry before organic chemistry?

Yes. Organic chemistry assumes you already know bonding, Lewis structures, electronegativity, acids and bases, and equilibrium, so a weak general chemistry base is the most common reason students struggle.