4.1.3

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Created by: Lara_Bryce
Created on: 29-12-17 20:40

What are alkenes?

Unsaturated hydrocarbons containing a C=C bond comprising a π-bond and a σ-bond; restricted rotation of the π-bond.

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What are π-bonds?

The sideways overlap of adjacent p-orbitals above and below the bonding C atoms.

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Explain the shape and bond angle around each carbon in the C=C of alkenes in terms of electron pair repulsion.

Trigonal planar and 120; there are 3 regions of electron density around each carbon atom, each region repels each other.

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What is a stereoisomer?

Compounds with the same structural formula but with a different arrangement in space.

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Explain E/Z isomerism a cis-trans isomerism.

Z (or cis) is the same side; cis-trans can only be used when there is a H atom attached.

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How do you use the Cahn-Ingold-Prelog priority rules?

The atoms attached to each carbon atom in a double bond are given priority based upon their atomic mass.

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Explain the reactivity of alkenes in terms of the relatively low bond enthalpy of the π-bond.

The π-electrons are outside of the double bond, so are more exposed than the electrons in the σ-bond; therefore the π-bond readily breaks and alkenes undergo addition reactions relatively easily.

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What is an electrophile?

An electron pair acceptor.

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What is Markownikoff's Rule?

Hydrogens go to the most hydrogens.

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Other cards in this set

Card 2

Front

What are π-bonds?

Back

The sideways overlap of adjacent p-orbitals above and below the bonding C atoms.

Card 3

Front

Explain the shape and bond angle around each carbon in the C=C of alkenes in terms of electron pair repulsion.

Back

Card 4

Front

What is a stereoisomer?

Back

Card 5

Front

Explain E/Z isomerism a cis-trans isomerism.

Back

View more cards

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4.1.3