IGCSE Chemistry Organic Chemistry

What is the general formula for alkanes?

• CnH2n

• CnH2n+2

• CnHn+2

• CnH2n-2

Give an example of a homologous series in organic chemistry.

• Carboxylic acids

• Alkenes

• Alcohols

• Alkanes

What is the functional group present in alkenes?

• Hydroxyl group

• Carbonyl group

• Nitro group

• Carbon-carbon double bond

Name the first member of the alkene series.

• Methane

• Butane

• Ethene

• Propane

What is the general formula for alkenes?

• CnH2n

• CnHn-2

• CnHn

• CnH2n+2

How many carbon atoms are present in butane?

• 8

• 2

• 6

• 4

What is the difference between alkanes and alkenes?

• The difference is that alkanes have single bonds and alkenes have at least one double bond.

• Alkanes and alkenes are both solid at room temperature.

• The difference is that alkanes have double bonds and alkenes have single bonds.

• Alkanes and alkenes are the same and can be used interchangeably.

What is the functional group present in alkanes?

• Alkanes contain the functional group -OH-

• Alkanes contain the functional group -COOH-

• Alkanes contain the functional group -CH2-

• Alkanes contain the functional group -NH2-

What is the name of the process by which alkenes are converted to alkanes?

• Dehydration

• Hydrogenation

• Substitution

• Oxidation

What is the general formula for the homologous series of alkanes?

• CnH2n+4

• CnH2n

• CnH2n-2

• CnH2n+2