CHEM 103 (General Chemistry) Module 5
2026 CHEM 103 (General Chemistry)
Module 5 Practice Exam 100 Questions
and Answers with Rationales
Organic Chemistry Fundamentals
1. Organic chemistry is primarily the study of compounds containing:
A. Oxygen
B. Nitrogen
C. ✅✅ Carbon
D. Sulfur
Answer: ✅✅ C
Rationale: Organic chemistry focuses on carbon-containing compounds, particularly those with
carbon–carbon and carbon–hydrogen bonds.
2. Which element is most commonly bonded to carbon in organic compounds?
A. Sodium
B. Chlorine
C. ✅✅ Hydrogen
D. Calcium
Answer: ✅✅ C
Rationale: Most organic molecules are hydrocarbons or contain C–H bonds.
3. Which compound is an alkane?
, CHEM 103 (General Chemistry) Module 5
A. Ethene
B. Ethyne
C. ✅✅ Ethane
D. Benzene
Answer: ✅✅ C
Rationale: Alkanes contain only single carbon–carbon bonds.
4. Alkenes are characterized by:
A. Triple bonds
B. ✅✅ One or more carbon–carbon double bonds
C. Aromatic rings
D. Ionic bonds
Answer: ✅✅ B
Rationale: Alkenes contain at least one C=C double bond.
5. Alkynes contain:
A. Single bonds only
B. Double bonds only
C. ✅✅ Carbon–carbon triple bonds
D. Aromatic rings
Answer: ✅✅ C
Rationale: Alkynes are unsaturated hydrocarbons containing C≡C triple bonds.
, CHEM 103 (General Chemistry) Module 5
6. Which functional group characterizes alcohols?
A. Carbonyl (C=O)
B. ✅✅ Hydroxyl (–OH)
C. Amino (–NH₂)
D. Carboxyl (–COOH)
Answer: ✅✅ B
Rationale: Alcohols contain one or more hydroxyl groups attached to carbon.
7. Which functional group is found in carboxylic acids?
A. Amino
B. Hydroxyl only
C. ✅✅ Carboxyl (–COOH)
D. Aldehyde
Answer: ✅✅ C
Rationale: Carboxylic acids contain the –COOH functional group.
8. Amines contain which functional group?
A. Carbonyl
B. ✅✅ Amino (–NH₂)
C. Ester
D. Ether
Answer: ✅✅ B
Rationale: Amines are organic derivatives of ammonia containing nitrogen.
, CHEM 103 (General Chemistry) Module 5
9. Which compound is classified as an alcohol?
A. CH₃COOH
B. ✅✅ CH₃CH₂OH
C. CH₃NH₂
D. CH₃CHO
Answer: ✅✅ B
Rationale: CH₃CH₂OH is ethanol, an alcohol.
10. Which compound contains a carboxyl group?
A. Ethanol
B. Acetone
C. ✅✅ Acetic acid
D. Propane
Answer: ✅✅ C
Rationale: Acetic acid contains the –COOH functional group.
Nomenclature & Isomerism
11. What is the IUPAC name of CH₄?
A. Ethane
B. ✅✅ Methane
C. Propane
2026 CHEM 103 (General Chemistry)
Module 5 Practice Exam 100 Questions
and Answers with Rationales
Organic Chemistry Fundamentals
1. Organic chemistry is primarily the study of compounds containing:
A. Oxygen
B. Nitrogen
C. ✅✅ Carbon
D. Sulfur
Answer: ✅✅ C
Rationale: Organic chemistry focuses on carbon-containing compounds, particularly those with
carbon–carbon and carbon–hydrogen bonds.
2. Which element is most commonly bonded to carbon in organic compounds?
A. Sodium
B. Chlorine
C. ✅✅ Hydrogen
D. Calcium
Answer: ✅✅ C
Rationale: Most organic molecules are hydrocarbons or contain C–H bonds.
3. Which compound is an alkane?
, CHEM 103 (General Chemistry) Module 5
A. Ethene
B. Ethyne
C. ✅✅ Ethane
D. Benzene
Answer: ✅✅ C
Rationale: Alkanes contain only single carbon–carbon bonds.
4. Alkenes are characterized by:
A. Triple bonds
B. ✅✅ One or more carbon–carbon double bonds
C. Aromatic rings
D. Ionic bonds
Answer: ✅✅ B
Rationale: Alkenes contain at least one C=C double bond.
5. Alkynes contain:
A. Single bonds only
B. Double bonds only
C. ✅✅ Carbon–carbon triple bonds
D. Aromatic rings
Answer: ✅✅ C
Rationale: Alkynes are unsaturated hydrocarbons containing C≡C triple bonds.
, CHEM 103 (General Chemistry) Module 5
6. Which functional group characterizes alcohols?
A. Carbonyl (C=O)
B. ✅✅ Hydroxyl (–OH)
C. Amino (–NH₂)
D. Carboxyl (–COOH)
Answer: ✅✅ B
Rationale: Alcohols contain one or more hydroxyl groups attached to carbon.
7. Which functional group is found in carboxylic acids?
A. Amino
B. Hydroxyl only
C. ✅✅ Carboxyl (–COOH)
D. Aldehyde
Answer: ✅✅ C
Rationale: Carboxylic acids contain the –COOH functional group.
8. Amines contain which functional group?
A. Carbonyl
B. ✅✅ Amino (–NH₂)
C. Ester
D. Ether
Answer: ✅✅ B
Rationale: Amines are organic derivatives of ammonia containing nitrogen.
, CHEM 103 (General Chemistry) Module 5
9. Which compound is classified as an alcohol?
A. CH₃COOH
B. ✅✅ CH₃CH₂OH
C. CH₃NH₂
D. CH₃CHO
Answer: ✅✅ B
Rationale: CH₃CH₂OH is ethanol, an alcohol.
10. Which compound contains a carboxyl group?
A. Ethanol
B. Acetone
C. ✅✅ Acetic acid
D. Propane
Answer: ✅✅ C
Rationale: Acetic acid contains the –COOH functional group.
Nomenclature & Isomerism
11. What is the IUPAC name of CH₄?
A. Ethane
B. ✅✅ Methane
C. Propane
