Question 1

Which of the following is the correct IUPAC name for a molecule with a six-carbon chain, a carboxylic acid group at one end, and no other substituents?

Accepted Answer

hexanoic acid

Question 2

A molecule contains a five-carbon chain with a ketone group on carbon 2 and a methyl group on carbon 4. What is its correct IUPAC name?

Accepted Answer

4-methylpentan-2-one

Question 3

Which of the following functional groups has the highest priority when naming organic compounds according to IUPAC rules?

Accepted Answer

Carboxylic acid

Question 4

What is the correct IUPAC name for the following structure: a four-carbon chain with a double bond between carbons 2 and 3 and an alcohol group on carbon 1?

Accepted Answer

$$	ext{but-2-en-1-ol}$$

Question 5

A molecule has the following structure: a benzene ring with a carboxylic acid group and an amino group in the para position. What is its IUPAC name?

Accepted Answer

$$	ext{4-aminobenzoic acid}$$

Question 6

Which of the following is a constitutional isomer of $$	ext{C}_4	ext{H}_{10}$$?

Accepted Answer

2-methylpropane

Question 7

When naming a molecule with both an alcohol and a ketone group, which suffix is used for the parent name?

Accepted Answer

-one (with hydroxy as a prefix for the alcohol)

Question 8

Which of the following is the correct order of priority for functional groups in IUPAC nomenclature (from highest to lowest)?

Accepted Answer

Carboxylic acid \u003e Ester \u003e Amide \u003e Aldehyde \u003e Ketone \u003e Alcohol

Question 9

A molecule has a cyclohexane ring with methyl groups at carbons 1 and 3. What is the correct IUPAC name?

Accepted Answer

1,3-dimethylcyclohexane

Question 10

Which of the following best describes configurational isomerism?

Accepted Answer

Isomers that differ in the spatial arrangement of atoms and cannot be interconverted without breaking covalent bonds

Question 11

What is the correct IUPAC name for a molecule with the following structure: $$	ext{CH}_3	ext{CH}_2	ext{CH}_2	ext{COOH}$$?

Accepted Answer

butanoic acid

Question 12

A molecule contains a triple bond between carbons 2 and 3 in a five-carbon chain. What is its IUPAC name?

Accepted Answer

pent-2-yne

Question 13

Which of the following is the correct IUPAC name for a molecule with a four-carbon chain, a chlorine atom on carbon 2, and an alcohol group on carbon 1?

Accepted Answer

2-chlorobutan-1-ol

Question 14

When naming a molecule with both a double bond and a triple bond, which group gets the lower locant if both are present?

Accepted Answer

The double bond (alkene)

Question 15

Which of the following is the correct IUPAC name for a molecule with a benzene ring and two methyl groups at positions 1 and 4?

Accepted Answer

1,4-dimethylbenzene

Question 16

A molecule has the formula $$	ext{C}_5	ext{H}_{12}. $$Which of the following is NOT a possible isomer?

Accepted Answer

cyclopentane

Question 17

Which of the following is the correct IUPAC name for a molecule with a three-carbon chain, an amino group on carbon 1, and a carboxylic acid group on carbon 3?

Accepted Answer

3-aminopropanoic acid

Question 18

Which of the following is the correct IUPAC name for a molecule with a cyclopentane ring and an ethyl group at carbon 1 and a methyl group at carbon 3?

Accepted Answer

1-ethyl-3-methylcyclopentane

Question 19

Which of the following statements about the use of locants in IUPAC nomenclature is correct?

Accepted Answer

Locants are assigned so that the highest priority functional group receives the lowest possible number.

Organic Chemistry I: Structures and Nomenclature (IUPAC Naming of Organic Compounds)

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