Alkene

What is the general formula for alkenes?

• CnHn+2

• CnH2n

• CnHn

• CnH3n

Name the alkene with two carbon atoms.

• Propene

• Methene

• Butene

• Ethene

Which reaction adds hydrogen to an alkene?

• Oxidation

• Sulfonation

• Hydrogenation

• Dehydration

Which alkene has three carbon atoms?

• Propene

• Butene

• Ethene

• Octene

What is the functional group present in alkenes?

• C-C

• C=C

What are the products of incomplete combustion of alkenes?

• carbon dioxide only

• carbon dioxide and water

• carbon monoxide only

• carbon monoxide and water

What is the catalyst needed for cracking?

• UV light

• aluminium oxide only

• silicon dioxide only

• aluminium oxide and silicon dioxide

What happens when aqueous bromine is added to alkene?

• Bromine remains purple black

• Bromine is decolourised

• Bromine remains reddish brown

• Bromide oxide is frmed.

What is the definition of cracking?

• Smaller hydrocarbon molecules react to form larger hydrocarbon molecules

• Larger hydrocarbon molecules reacts to form smaller hydrocarbon molecules

• Smaller hydrocarbon molecules joined to form a larger hydrocarbon molecules.

• Larger hydrocarbon molecules break down to form smaller hydrocarbon molecules

What is the product formed from this cracking?

C12H26 --> C5H12 + ..............

• C5H12

• C7H12

• C7H26

• C7H14