Why organic chemistry cares about carbon
Carbon forms strong covalent bonds and chains, so it can build huge, varied molecules. In class you learn to read structures the way you read a map: count carbons, spot functional groups, and track how electrons move in a reaction.
Hydrocarbons first
Alkanes have only single bonds (saturated). Alkenes include a C=C double bond. Alkynes include a carbon–carbon triple bond. Aromatic rings (like benzene) have a special delocalized bonding picture—draw them the way your teacher requires.
Functional groups to recognize early
- Alcohol (–OH): hydrogen bonding; affects boiling point and acidity a little in intro courses.
- Carbonyl (C=O): shows up in aldehydes and ketones.
- Carboxylic acid (–COOH): donates H⁺ more readily than a typical alcohol.
- Amine (–NH₂): behaves as a weak base in many textbook examples.
Isomers (same formula, different molecule)
Constitutional isomers have different connectivity. Stereoisomers have the same bonds but different 3D arrangement—cis/trans around a double bond is a common first example. If your class does chirality, practice drawing mirror images and deciding whether they are superimposable.
Reaction families you will name over and over
Many courses emphasize substitution and elimination (SN1/SN2/E1/E2). Keep a one-line “decision rule” for each from lecture: substrate structure, strength of nucleophile/base, solvent, temperature. Electrophilic addition shows up with alkenes; markovnikov vs. anti-markovnikov patterns depend on the reagents your unit lists.
How to study mechanisms cleanly
Draw curved arrows from electron-rich to electron-poor sites. Never move atoms casually—only electrons. Label nucleophile, electrophile, and leaving group until those words feel boring; that is when they start helping on exams.
Quick review checklist
Run this on paper the night before an assessment—short answers, no peeking.
- Vocabulary: Five terms, defined in your own words.
- One strong example: Problem, diagram, quote+context, or map label your rubric would accept.
- Classic trap: What mistake shows up on every test—and what rule stops it?
- Connection: One sentence linking this topic to another unit from the same course.