Hydrocarbon Cheat Sheet

Key Definitions

• Hydrocarbon: Organic compounds consisting entirely of hydrogen and carbon atoms. ✅

• Aliphatic Hydrocarbons: Hydrocarbons with straight or branched chains. ✅

• Aromatic Hydrocarbons: Hydrocarbons containing one or more aromatic rings. ✅

Important Concepts

Types of Hydrocarbons

• Saturated Hydrocarbons: Contain only single bonds (alkanes). ✅

• Unsaturated Hydrocarbons: Contain double or triple bonds (alkenes, alkynes). ✅

• Isomerism: Compounds with the same molecular formula but different structures. ✅

Reactions of Hydrocarbons

• Combustion: Hydrocarbons react with oxygen to produce CO₂ and H₂O. ✅

• Substitution: Involves replacing hydrogen atoms with other atoms/groups. ✅

• Addition: Atoms are added across double/triple bonds. ✅

Key Formulas

• n: Number of carbon atoms

• C_nH_(2n) (for alkenes) ✅

• C_nH_(2n-2) (for alkynes) ✅

Common Mistakes to Avoid

Common Mistake: Confusing alkenes and alkynes based on the number of hydrogen atoms.

Memory Tricks

Tip: "A Little Ado" —

• A: Alkanes (single bonds)

• L: Alkenes (double bonds)

• A: Alkynes (triple bonds)

Key Diagrams

   Alkanes:     Alkenes:      Alkynes:
     C-C           C=C         C≡C
    /   \         /   \       /   \
   H     H       H     H     H     H