CHEM 219 FINAL EXAM (NEW UPDATED VERSION) LATEST ACTUAL
EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED QUESTIONS
AND ANSWERS) | GUARANTEED PASS A+ [2026]
1. Which of the following is the correct hybridization of the carbon in methane (CH₄)?
A. sp
B. sp²
C. sp³
D. dsp³
Answer: C
Rationale: Carbon in CH₄ forms four sigma bonds with tetrahedral geometry → sp³ hybridized.
2. What is the functional group in an alcohol?
A. –OH
B. –COOH
C. –NH₂
D. –CHO
Answer: A
Rationale: Alcohols contain a hydroxyl (–OH) group bonded to a saturated carbon.
3. The IUPAC name for CH₃–CH₂–OH is:
A. Methanol
B. Ethanol
C. Propanol
D. Ethanal
Answer: B
Rationale: Two-carbon alcohol → “ethanol.”
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2026 Graded A+ EXAM
, 4. Which of the following is a primary alcohol?
A. CH₃CH₂OH
B. (CH₃)₂CHOH
C. CH₃CH₂CH₂OH
D. Both A and C
Answer: D
Rationale: Primary alcohol has the –OH group attached to a carbon bonded to only one other
carbon.
5. Which type of bond exists in alkanes?
A. Sigma bonds only
B. Pi bonds only
C. Sigma and pi bonds
D. Ionic bonds
Answer: A
Rationale: Alkanes are saturated hydrocarbons with only single (σ) bonds.
6. Which of the following is an alkene?
A. CH₄
B. C₂H₆
C. C₂H₄
D. C₂H₂
Answer: C
Rationale: Alkenes contain a carbon–carbon double bond → C₂H₄ (ethene).
7. How many degrees of unsaturation are in C₃H₄?
A. 1
B. 2
C. 3
D. 0
Answer: B
2
Rationale: Degrees of unsaturation = (2C + 2 – H)/2 = (2×3 + 2 – 4)/2 = 2.
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2026 Graded A+ EXAM
, 8. The geometry around an sp² carbon is:
A. Linear
B. Trigonal planar
C. Tetrahedral
D. Bent
Answer: B
Rationale: sp² hybridization → 3 sigma bonds and trigonal planar geometry.
9. Which of the following is a characteristic reaction of alkenes?
A. Hydrogenation
B. Substitution
C. Oxidation to carboxylic acids
D. Dehydration
Answer: A
Rationale: Alkenes undergo addition reactions like hydrogenation due to the double bond.
10. Markovnikov’s rule predicts:
A. H adds to the less substituted carbon of a double bond
B. H adds to the more substituted carbon
C. Halogens never add to alkenes
D. Only radicals react
Answer: A
Rationale: The hydrogen adds to the carbon with more hydrogens (less substituted), halogen to
more substituted.
11. Which reagent converts an alcohol into a ketone?
A. PCC
B. NaBH₄
C. Jones reagent (CrO₃/H₂SO₄)
D. LiAlH₄
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2026 Graded A+ EXAM
EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED QUESTIONS
AND ANSWERS) | GUARANTEED PASS A+ [2026]
1. Which of the following is the correct hybridization of the carbon in methane (CH₄)?
A. sp
B. sp²
C. sp³
D. dsp³
Answer: C
Rationale: Carbon in CH₄ forms four sigma bonds with tetrahedral geometry → sp³ hybridized.
2. What is the functional group in an alcohol?
A. –OH
B. –COOH
C. –NH₂
D. –CHO
Answer: A
Rationale: Alcohols contain a hydroxyl (–OH) group bonded to a saturated carbon.
3. The IUPAC name for CH₃–CH₂–OH is:
A. Methanol
B. Ethanol
C. Propanol
D. Ethanal
Answer: B
Rationale: Two-carbon alcohol → “ethanol.”
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2026 Graded A+ EXAM
, 4. Which of the following is a primary alcohol?
A. CH₃CH₂OH
B. (CH₃)₂CHOH
C. CH₃CH₂CH₂OH
D. Both A and C
Answer: D
Rationale: Primary alcohol has the –OH group attached to a carbon bonded to only one other
carbon.
5. Which type of bond exists in alkanes?
A. Sigma bonds only
B. Pi bonds only
C. Sigma and pi bonds
D. Ionic bonds
Answer: A
Rationale: Alkanes are saturated hydrocarbons with only single (σ) bonds.
6. Which of the following is an alkene?
A. CH₄
B. C₂H₆
C. C₂H₄
D. C₂H₂
Answer: C
Rationale: Alkenes contain a carbon–carbon double bond → C₂H₄ (ethene).
7. How many degrees of unsaturation are in C₃H₄?
A. 1
B. 2
C. 3
D. 0
Answer: B
2
Rationale: Degrees of unsaturation = (2C + 2 – H)/2 = (2×3 + 2 – 4)/2 = 2.
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2026 Graded A+ EXAM
, 8. The geometry around an sp² carbon is:
A. Linear
B. Trigonal planar
C. Tetrahedral
D. Bent
Answer: B
Rationale: sp² hybridization → 3 sigma bonds and trigonal planar geometry.
9. Which of the following is a characteristic reaction of alkenes?
A. Hydrogenation
B. Substitution
C. Oxidation to carboxylic acids
D. Dehydration
Answer: A
Rationale: Alkenes undergo addition reactions like hydrogenation due to the double bond.
10. Markovnikov’s rule predicts:
A. H adds to the less substituted carbon of a double bond
B. H adds to the more substituted carbon
C. Halogens never add to alkenes
D. Only radicals react
Answer: A
Rationale: The hydrogen adds to the carbon with more hydrogens (less substituted), halogen to
more substituted.
11. Which reagent converts an alcohol into a ketone?
A. PCC
B. NaBH₄
C. Jones reagent (CrO₃/H₂SO₄)
D. LiAlH₄
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2026 Graded A+ EXAM
