42 8.3 Naming Organic Compounds

Practice questions

1. Look up the IUPAC names for acetic acid, chloroform, and acetone. One place you can find these is on Wikipedia, in the box of chemical information that is on the right side of the page. Wikipedia is quite reliable for this type of technical information. Other reliable sources for this kind of information include ChemSpider and PubChem. What are the correct IUPAC names of the following chemicals: choose from these names- Trichloromethane, 2-propanone, and ethanoic acid.
   1. 1. Acetic acid,
      2. Chloroform
      3. Acetone
2. Which of these structures is 5-chloropentanal?
   1. 1. A five-carbon straight chain. The first carbon has a carbon-carbon double bond, and the fifth carbon has chlorine atoms attached.
      2. A hexane ring with a methyl group attached to one of the carbons.
      3. A hexane ring with two methyl groups attached to the second carbon and one oxygen attached to the first carbon forms a carbon-oxygen double bond.
3. Which structure shows 2,2-dimethylcyclohexanone?
   1. 1. A five-carbon straight chain. The first carbon has a carbon-carbon double bond, and the fifth carbon has chlorine atoms attached.
      2. A hexane ring with a methyl group attached to one of the carbons.
      3. A hexane ring with two methyl groups attached to the second carbon and one oxygen attached to the first carbon forms a carbon-oxygen double bond.
4. Which of these is methylcyclohexane?
   1. 1. A five-carbon straight chain. The first carbon has a carbon-carbon double bond, and the fifth carbon has chlorine atoms attached.
      2. A hexane ring with a methyl group attached to one of the carbons.
      3. A hexane ring with two methyl groups attached to the second carbon and one oxygen attached to the first carbon forms a carbon-oxygen double bond.
5. Which structure represents the substance named pentane?
   1. 1. One carbon with four hydrogens attached.
      2. Five carbons in a straight chain with 12 hydrogens,
      3. Hexane ring.

Answers

1. 1. 1. ethanoic acid
      2. trichloromethane
      3. 2-propanone
2. a
3. c
4. b
5. b