Chemistry AS 2 2.4 Alkenes

What is an unsaturated hydrocarbon?

• A hydrocarbon with only single bonds

• A hydrocarbon with at least one C=C or C≡C bond

• A hydrocarbon with no carbon atoms

• A hydrocarbon with only C-H bonds

What type of bonds do alkenes contain?

• Only sigma bonds

• Only pi bonds

• Sigma and pi bonds

• Only ionic bonds

What catalyst is used in the hydrogenation of alkenes?

• Finely divided nickel

• Platinum

• Copper

• Iron

What is the IUPAC rule for naming alkenes?

• Select the shortest chain of C atoms

• Select the longest chain of C atoms containing the double bond

• Select the chain with the most hydrogen atoms

• Select the chain with the least carbon atoms

What is the diagnostic test for the alkene functional group?

• Bromine water

• Litmus paper

• Silver nitrate

• Benedict's solution

What happens to bromine water in the presence of a C=C double bond?

• It decolourises

• It turns blue

• It turns red

• It remains unchanged

What are monomers?

• Large molecules

• Small molecules that join together to form a polymer

• Types of metals

• Types of gases

Which of the following is a monomer?

• Ethene

• Polythene

• Nylon

• Silk

Which of the following is a characteristic of addition polymerization?

• Loss of small molecules

• Formation of a single product

• Requires a solvent

• Involves a catalyst