Alkenes (OCR A-Level Chemistry A): Flashcards

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Properties of alkenes
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Type of hydrocarbon that alkenes are classified as

Unsaturated hydrocarbons

General formula for alkenes with one C=C bond

CnH2n\text{C}_n\text{H}_{2n}

Key functional group in alkenes

Carbon-carbon double bond (C=C)

Two types of bonds in a C=C double bond

Sigma bond (σ) and pi bond (π)

How pi bond forms in alkenes

Sideways/lateral overlap of p-orbitals

Effect of pi bond on rotation around C=C

Restricts rotation

Shape around each carbon in C=C double bond

Trigonal planar

Bond angle in trigonal planar arrangement

120°

Number of sigma bonds each C in C=C forms

Three sigma bonds

Molecular formula of limonene

C10H16\text{C}_{10}\text{H}_{16}

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