Structural Isomers of Alkanes Quiz

What are structural isomers?

• Molecules with the same molecular formula but different structural arrangement

• Molecules with different molecular formula and structural arrangement

• Molecules with different molecular formula but the same structural arrangement

• Molecules with the same molecular formula and structural arrangement

What is the name of the compound discovered in 1923 that helped petrol burn smoothly but was toxic?

• Pentane

• Tetraethyl lead

• Ethane

• Methane

What is the name of the isomer with 5 carbons in the stem and a methyl group on the second carbon atom?

• Two-methylpentane

• Pentane

• Butane

• Three-methylpentane

What is the name of the isomer of hexane with a methyl group each on the second and third carbon atoms?

• Two, two-dimethylbutane

• Two-methylpentane

• Two, three-dimethylbutane

• Three-methylpentane

What is the main reason for the addition of lead to petrol in the 1920s?

• To reduce toxicity

• To increase fuel efficiency

• To reduce engine noise

• To help petrol burn smoothly

If at least one branch is present, what is the longest carbon chain in the molecule C4H10?

• Four carbon atoms long

• Five carbon atoms long

• Three carbon atoms long

• Two carbon atoms long