Examples. • Propane (C3H8) • Cyclohexane (C6H12)

• Propane (C₃H₈) • Cyclohexane (C₆H₁₂)

• Butane (C₄H₁₀) • Cyclopentane (C₅H₁₀)

• Pentane (C₅H₁₂) • Decane (C₁₀H₂₂)

Alkenes

Alkenes are hydrocarbons having at least one C=C double bond. The simplest alkene is ethene, in which two carbon atoms are linked with a double covalent bond. Alkenes exhibitcis-trans isomerism, and are more reactive than alkanes. The general formula for alkenes with a single double-bond is CnH_2n, while the same for cyclic alkenes is CnH_2n-2. Alkenes with more than one double bond, are known as polyenes.

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