Alkenes

What are alkenes?

Unsaturated hydrocarbons containing at least one carbon–carbon double bond.

What is the general formula of alkenes with one C

C bond in an open chain?

Why are alkenes described as unsaturated?

They contain a carbon–carbon double bond.

What is the functional group of an alkene?

The C

What is the molecular formula of ethene?

C₂H₄.

What is the molecular formula of propene?

C₃H₆.

What is the molecular formula of butene?

C₄H₈.

What is the molecular formula of pentene?

C₅H₁₀.

What is the molecular formula of hexene?

C₆H₁₂.

What is the smallest possible alkene?

Ethene.

Why can methane not form an alkene?

A carbon–carbon double bond requires at least two carbon atoms.

What is the main difference between ethane and ethene?

Ethane has a C–C single bond, while ethene has a C

Why are alkenes generally more reactive than alkanes?

Their carbon–carbon double bond can undergo addition reactions.

What is the main reaction type of alkenes?

Addition reactions.

What happens to the carbon–carbon double bond during an addition reaction?

The double bond becomes a single bond as new atoms or groups are added.

Why are alkenes useful in manufacturing?

They are used to produce polymers, alcohols and other organic chemicals.

What is the relationship between consecutive members of the alkene homologous series?

Each differs by CH₂.

Do alkenes undergo combustion?

Yes, they react with oxygen and release energy.