Nomenclature of Organic Compounds Questions

IUPAC, The International Union of Pure and Applied Chemistry has specified certain rules for the nomenclature of organic compounds. They are made to avoid difficulties caused by arbitrary nomenclature.

Nomenclature of Organic Compounds Chemistry Questions with Solutions

Q1. The IUPAC name of CH₃CHO is

1. Ethanal
2. Ethanol
3. Acetaldehyde
4. Acetone

Answer: (a), The IUPAC name of CH₃CHO is Ethanal.

Q2. The IUPAC name of CH₃-O-C₂H₅ is

1. Methoxy ethane
2. Ethoxy ethane
3. Methyl ethane
4. Ethyl ethane

Answer: (a), The IUPAC name of CH₃-O-C₂H₅ is Methoxy ethane.

Q3. Select the correct IUPAC name for

1. 3,3 –dimethyl -3- oxocyclohexane
2. 1,1 –dimethyl -3-cyclohexanol
3. 3,3- dimethyl -1- cyclo-oxanol
4. 1,1- dimethyl -1- cyclo-oxanol

Answer: (b), The IUPAC name of aforementioned compound is 1,1 –dimethyl -3-cyclohexanol.

Q4. Select the correct IUPAC name for

1. 4-ethyl-3, 3-dimethylheptane
2. 4-ethyl-4, 3-dimethylheptane
3. 3-ethyl-3, 4-dimethylheptane
4. 3-ethyl-4, 4-dimethylheptane

Answer: (d), The IUPAC name of the aforementioned compound is 3-ethyl-4, 4-dimethylheptane.

Q5. The IUPAC name of acetylsalicylic acid is

1. 2-acetoxy benzoic acid
2. 1-acetoxy benzoic acid
3. 4-acetoxy benzoic acid
4. 3-acetoxy benzoic acid

Answer: (a), The IUPAC name of the compound above is 2-acetoxy benzoic acid.

Q6. Dienes are the name given to compounds with _________

1. One double bond
2. Two double bonds
3. More than one double bond
4. None of the above

Answer: (b), Dienes are the name given to compounds with two double bonds.

Q7. Identify the smallest alkane which can form a ring structure.

1. Ethane
2. Cyclo ethane
3. Propane
4. Cyclopropane

Answer: (d), The smallest alkane which can form a ring structure is a cyclopropane.

Q8. Select the correct IUPAC name of neopentane.

1. 3, 3–dimethylpropane
2. 1, 2–dimethylpropane
3. 2, 3–dimethylpropane
4. 2, 2–dimethylpropane

Answer: (d), The correct IUPAC name of neopentane is 2, 2–dimethylpropane.

Structure of neopentane:

Q9. Select the correct name of the following compound.

1. 1, 2-epoxy propane
2. 2, 2-epoxy propane
3. Epoxy propane
4. None of the above

Answer: (a), The correct name of the above compound is 1, 2-epoxy propane.

Q10. Identify the formula of ethanol.

1. CH₃CHO
2. CH₃COCH₃
3. CH₃CH₂CHO
4. CH₃CH₂OH

Answer: (d), The correct formula of ethanol is CH₃CH₂OH.

Q11. What is the order of priority of functional groups?

Answer: The order of importance of the functional groups in the IUPAC system of nomenclature is Carboxylic Acid > Sulfonic Acid > Esters > Acid Halides > Amides > Cyanides > Aldehyde > Ketones > Alcohols > Amines > Alkynes > Alkenes > Alkanes.

Q12. What is a functional group?

Answer: A functional group is the group of atoms in a molecule that determines the chemical behaviour of the molecule. It determines the chemical properties of the molecule.

Q13. Give examples of a few functional groups along with their formula.

Answer: Examples of a few functional groups and their formula are mentioned below.

Carboxylic Acid ( -COOH)

Alcohol ( -OH)

Aldehyde ( -CHO)

Ketone (-CO-)

Ester ( -COOR)

Cyanide ( -CN)

Amide ( -CONH₂)

Acid Halide ( -COOCl)

Sulfonic Acid ( -SO₃H)

Q14. The IUPAC name of the compound

1. 3-Bromo-1-chlorocyclohexene
2. 1-Bromo-3-chlorocyclohexene
3. 3-Bromo-1-chlorohexidine
4. 1-Bromo-3-chlorohexidine

Answer: (a), The IUPAC name of the compound is 3-Bromo-1-chlorocyclohexene.

Q15. Match the following.

Column 1	Column 2
Salicylic Acid
Neopentane
o – xylene
Toluene
Acetone
Diethyl ether

Answer:

Column 1	Column 2
Salicylic Acid
Neopentane
o – xylene
Toluene
Acetone
Diethyl ether

Practise Questions on Nomenclature of Organic Compounds

Q1. What are the rules of nomenclature?

Q2. What is the IUPAC name of the following compound?

1. 4-Bromo-3-methyl pent-2-ene
2. 3-Bromo-4-methyl pent-2-ene
3. 3-Bromo-1,2-dimethyl but-1-ene
4. 1-Bromo-1,3-dimethyl but-1-ene

Q3. What is the IUPAC name of the following compound?

Q4. What is the IUPAC name of CH₃C ≡ N?

Q5. What is the IUPAC name of CH₃COOC₂H₅?

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