ORGANIC CHEMISTRY (CHEM 101–219) EXAM
LATEST 2026 UPDATE 100 QUESTIONS AND
DETAILED VERIFIED ANSWERS FROM ACTUAL
EXAMS TEST GRADE A+
1. What is the IUPAC name of CH₃–CH₂–CH₃?
A. Methane
B. Ethane
C. Propane
D. Butane
Rationale: A 3-carbon straight chain alkane is propane.
Answer: C. Propane
2. Which functional group is present in alcohols?
A. –COOH
B. –OH
C. –CHO
D. –NH₂
Rationale: Alcohols contain the hydroxyl group.
Answer: B. –OH
3. What is the hybridization of carbon in methane (CH₄)?
A. sp
B. sp²
C. sp³
D. dsp²
,Rationale: Methane has tetrahedral geometry with sp³ hybridization.
Answer: C. sp³
4. Which of the following is an alkene?
A. C₂H₆
B. C₃H₈
C. C₂H₄
D. C₂H₂
Rationale: Alkenes contain at least one C=C double bond.
Answer: C. C₂H₄
5. What is the general formula of alkanes?
A. CₙH₂ₙ
B. CₙH₂ₙ₊₂
C. CₙHₙ
D. CₙH₂ₙ₋₂
Rationale: Alkanes are saturated hydrocarbons.
Answer: B. CₙH₂ₙ₊₂
6. Which reaction converts alkenes into alkanes?
A. Halogenation
B. Hydrogenation
C. Polymerization
D. Dehydration
Rationale: Hydrogenation adds H₂ across double bonds.
Answer: B. Hydrogenation
7. What is the functional group of aldehydes?
, A. –OH
B. –CO–
C. –CHO
D. –COOH
Rationale: Aldehydes contain a terminal carbonyl group.
Answer: C. –CHO
8. Which compound is aromatic?
A. Cyclohexane
B. Benzene
C. Ethene
D. Propane
Rationale: Benzene has a stable aromatic π-electron system.
Answer: B. Benzene
9. What type of bond is in alkanes?
A. Double bonds
B. Triple bonds
C. Single bonds
D. Ionic bonds
Rationale: Alkanes contain only single sigma bonds.
Answer: C. Single bonds
10. Which is a nucleophile?
A. H⁺
B. OH⁻
C. BF₃
D. AlCl₃
LATEST 2026 UPDATE 100 QUESTIONS AND
DETAILED VERIFIED ANSWERS FROM ACTUAL
EXAMS TEST GRADE A+
1. What is the IUPAC name of CH₃–CH₂–CH₃?
A. Methane
B. Ethane
C. Propane
D. Butane
Rationale: A 3-carbon straight chain alkane is propane.
Answer: C. Propane
2. Which functional group is present in alcohols?
A. –COOH
B. –OH
C. –CHO
D. –NH₂
Rationale: Alcohols contain the hydroxyl group.
Answer: B. –OH
3. What is the hybridization of carbon in methane (CH₄)?
A. sp
B. sp²
C. sp³
D. dsp²
,Rationale: Methane has tetrahedral geometry with sp³ hybridization.
Answer: C. sp³
4. Which of the following is an alkene?
A. C₂H₆
B. C₃H₈
C. C₂H₄
D. C₂H₂
Rationale: Alkenes contain at least one C=C double bond.
Answer: C. C₂H₄
5. What is the general formula of alkanes?
A. CₙH₂ₙ
B. CₙH₂ₙ₊₂
C. CₙHₙ
D. CₙH₂ₙ₋₂
Rationale: Alkanes are saturated hydrocarbons.
Answer: B. CₙH₂ₙ₊₂
6. Which reaction converts alkenes into alkanes?
A. Halogenation
B. Hydrogenation
C. Polymerization
D. Dehydration
Rationale: Hydrogenation adds H₂ across double bonds.
Answer: B. Hydrogenation
7. What is the functional group of aldehydes?
, A. –OH
B. –CO–
C. –CHO
D. –COOH
Rationale: Aldehydes contain a terminal carbonyl group.
Answer: C. –CHO
8. Which compound is aromatic?
A. Cyclohexane
B. Benzene
C. Ethene
D. Propane
Rationale: Benzene has a stable aromatic π-electron system.
Answer: B. Benzene
9. What type of bond is in alkanes?
A. Double bonds
B. Triple bonds
C. Single bonds
D. Ionic bonds
Rationale: Alkanes contain only single sigma bonds.
Answer: C. Single bonds
10. Which is a nucleophile?
A. H⁺
B. OH⁻
C. BF₃
D. AlCl₃
