Alkenes Quiz

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

• CnH2n-2

• CnH2n+1

• CnH2n+2

• CnH2n

Why are alkene molecules considered unsaturated?

• They contain two fewer hydrogen atoms than the corresponding alkane.

• They contain more carbon atoms than alkanes.

• They are more reactive than alkanes.

• They have a triple bond.

Which of the following is NOT one of the first four members of the alkene series?

• Ethene

• Propene

• Butene

• Hexene

What is the functional group of alkenes?

• C=C

• C-C

• C≡C

• OH

How do alkenes typically burn in air?

• With a smoky flame due to incomplete combustion

• With a bright flame due to complete combustion

• Without any flame

• With a blue flame

What happens to the double bond in alkenes during addition reactions?

• It becomes a triple bond.

• It becomes a single carbon-carbon bond.

• It remains unchanged.

• It breaks completely.

Which of the following is a reaction that alkenes undergo?

• Addition of hydrogen

• Substitution with oxygen

• Polymerization with nitrogen

• Oxidation with sulfur

What is the molecular formula for propene?

• C3H6

• C2H4

• C4H8

• C5H10

Which of the following is NOT a reaction condition for alkenes?

• High pressure for combustion

• High temperature for addition of hydrogen

• Presence of a catalyst for addition of water

• Low pressure for addition of halogens

What is the product when ethene reacts with hydrogen?

• Methane

• Ethyne

• Ethane

• Propane