Naming branched chain hydrocarbons

What is the correct name for a hydrocarbon chain with seven carbons and a single methyl group on the third carbon?

• 3-methylethane

• 7-methylheptane

• 3-methylheptane

• 1-methylheptane

If a molecule has two methyl groups both on the third carbon, what is its name?

• 2,3-dimethylheptane

• 3-methylheptane

• 3,5-dimethylheptane

• 3,3-dimethylheptane

What is the name of a molecule based on pentane with a methyl group on the third carbon?

• 3-methylpentane

• 5-methylpentane

• 3-methylhexane

• 1-methylpentane

How do you name a molecule with an eight-carbon chain and a methyl and an ethyl group?

• 5-ethyl-3-methyl octane

• 3-methyl-5-ethyl octane

• 3-ethyl-5-methyl octane

• 8-ethyl-1-methyl octane

In a branched alkene with a double bond between carbons two and three, and a methyl group on carbon three, what is the correct name?

• 3-methyl-2-ene

• 2-methyl-3-ene

• 3-methyl-1-ene

• 2,3-dimethyl-ene