Organic Chemistry Examination
Newest With Complete Questions And
Correct Detailed Answers| Brand New
Version!2026 2027
1. What is the hybridization of carbon in methane (CH₄)?
A. sp
B. sp²
C. sp³
D. sp³d
Answer: sp³
Bold italics rationale: Carbon forms four sigma bonds,
requiring sp³ hybridization.
2. Which functional group is characteristic of alcohols?
A. Carbonyl
B. Carboxyl
C. Hydroxyl
D. Ether
Answer: Hydroxyl
Bold italics rationale: Alcohols contain a hydroxyl (–OH)
group bonded to carbon.
3. What is the molecular formula of benzene?
A. C₆H₁₂
B. C₆H₆
C. C₅H₆
, D. C₆H₁₀
Answer: C₆H₆
Bold italics rationale: Benzene has six carbons and six
hydrogens in an aromatic ring.
4. Which bond results from side-by-side overlap of p-
orbitals?
A. Sigma
B. Ionic
C. Pi
D. Hydrogen
Answer: Pi
Bold italics rationale: Pi bonds form from lateral
overlap of p-orbitals.
5. What geometry results from sp² hybridization?
A. Linear
B. Tetrahedral
C. Trigonal planar
D. Octahedral
Answer: Trigonal planar
Bold italics rationale: sp² hybridization creates three
regions of electron density at 120°.
6. Which reagent oxidizes a primary alcohol to an
aldehyde?
A. KMnO₄
B. PCC
, C. NaBH₄
D. LiAlH₄
Answer: PCC
Bold italics rationale: PCC stops oxidation at the
aldehyde stage.
7. Converting an alkene to an alkane is classified as which
reaction?
A. Oxidation
B. Elimination
C. Reduction
D. Substitution
Answer: Reduction
Bold italics rationale: Adding hydrogen reduces the
molecule.
8. Which group defines carboxylic acids?
A. –CHO
B. –COOH
C. –OH
D. –CO–
Answer: –COOH
Bold italics rationale: Carboxylic acids contain both
carbonyl and hydroxyl groups.
9. What is the simplest alkene?
A. Methene
B. Ethene
C. Propene
, D. Butene
Answer: Ethene
Bold italics rationale: Ethene is the smallest molecule
with a C=C bond.
10. Isomers differing in connectivity are called:
A. Enantiomers
B. Diastereomers
C. Constitutional isomers
D. Conformers
Answer: Constitutional isomers
Bold italics rationale: Connectivity differences define
constitutional isomers.
11. The bond angle in a tetrahedral molecule is:
A. 90°
B. 109.5°
C. 120°
D. 180°
Answer: 109.5°
Bold italics rationale: Tetrahedral geometry minimizes
repulsion at 109.5°.
12. Which mechanism forms a carbocation
intermediate?
A. SN2
B. E2
C. SN1
Newest With Complete Questions And
Correct Detailed Answers| Brand New
Version!2026 2027
1. What is the hybridization of carbon in methane (CH₄)?
A. sp
B. sp²
C. sp³
D. sp³d
Answer: sp³
Bold italics rationale: Carbon forms four sigma bonds,
requiring sp³ hybridization.
2. Which functional group is characteristic of alcohols?
A. Carbonyl
B. Carboxyl
C. Hydroxyl
D. Ether
Answer: Hydroxyl
Bold italics rationale: Alcohols contain a hydroxyl (–OH)
group bonded to carbon.
3. What is the molecular formula of benzene?
A. C₆H₁₂
B. C₆H₆
C. C₅H₆
, D. C₆H₁₀
Answer: C₆H₆
Bold italics rationale: Benzene has six carbons and six
hydrogens in an aromatic ring.
4. Which bond results from side-by-side overlap of p-
orbitals?
A. Sigma
B. Ionic
C. Pi
D. Hydrogen
Answer: Pi
Bold italics rationale: Pi bonds form from lateral
overlap of p-orbitals.
5. What geometry results from sp² hybridization?
A. Linear
B. Tetrahedral
C. Trigonal planar
D. Octahedral
Answer: Trigonal planar
Bold italics rationale: sp² hybridization creates three
regions of electron density at 120°.
6. Which reagent oxidizes a primary alcohol to an
aldehyde?
A. KMnO₄
B. PCC
, C. NaBH₄
D. LiAlH₄
Answer: PCC
Bold italics rationale: PCC stops oxidation at the
aldehyde stage.
7. Converting an alkene to an alkane is classified as which
reaction?
A. Oxidation
B. Elimination
C. Reduction
D. Substitution
Answer: Reduction
Bold italics rationale: Adding hydrogen reduces the
molecule.
8. Which group defines carboxylic acids?
A. –CHO
B. –COOH
C. –OH
D. –CO–
Answer: –COOH
Bold italics rationale: Carboxylic acids contain both
carbonyl and hydroxyl groups.
9. What is the simplest alkene?
A. Methene
B. Ethene
C. Propene
, D. Butene
Answer: Ethene
Bold italics rationale: Ethene is the smallest molecule
with a C=C bond.
10. Isomers differing in connectivity are called:
A. Enantiomers
B. Diastereomers
C. Constitutional isomers
D. Conformers
Answer: Constitutional isomers
Bold italics rationale: Connectivity differences define
constitutional isomers.
11. The bond angle in a tetrahedral molecule is:
A. 90°
B. 109.5°
C. 120°
D. 180°
Answer: 109.5°
Bold italics rationale: Tetrahedral geometry minimizes
repulsion at 109.5°.
12. Which mechanism forms a carbocation
intermediate?
A. SN2
B. E2
C. SN1
