Organic Chemistry I Final Exam
1. Which atom is most electronegative?
A. Carbon
B. Nitrogen
C. Oxygen
D. Hydrogen
Answer: C. Oxygen
Oxygen has a higher electronegativity than carbon, nitrogen, and hydrogen, making it more effective
at attracting shared electrons.
2. What is the hybridization of carbon in methane (CH₄)?
A. sp
B. sp²
C. sp³
D. dsp²
Answer: C. sp³
Carbon forms four equivalent sigma bonds in methane, requiring sp³ hybridization and a tetrahedral
geometry.
3. The bond angle in an sp²-hybridized carbon is approximately:
A. 109.5°
B. 180°
C. 120°
D. 90°
Answer: C. 120°
sp² hybridization produces trigonal planar geometry with bond angles near 120°.
4. Which bond is strongest?
A. C–C
B. C=C
C. C≡C
D. All equal
Answer: C. C≡C
Triple bonds contain one sigma and two pi bonds, resulting in the greatest bond strength.
5. What is the molecular formula of benzene?
,A. C₆H₁₂
B. C₆H₆
C. C₆H₈
D. C₅H₆
Answer: B. C₆H₆
Benzene consists of six carbons and six hydrogens arranged in an aromatic ring.
6. Which functional group defines alcohols?
A. Carbonyl
B. Hydroxyl
C. Carboxyl
D. Amino
Answer: B. Hydroxyl
Alcohols contain the hydroxyl (–OH) functional group attached to carbon.
7. Which compound is an alkane?
A. Ethene
B. Ethyne
C. Ethanol
D. Ethane
Answer: D. Ethane
Alkanes contain only single carbon-carbon bonds; ethane is the simplest example after methane.
8. Which intermolecular force is strongest?
A. London dispersion
B. Dipole-dipole
C. Hydrogen bonding
D. Van der Waals
Answer: C. Hydrogen bonding
Hydrogen bonding is a particularly strong dipole interaction involving H bonded to N, O, or F.
9. What is the IUPAC name of CH₃CH₂CH₃?
A. Methane
B. Ethane
C. Propane
D. Butane
Answer: C. Propane
The molecule contains three carbon atoms in a continuous chain.
, 10. The general formula for alkanes is:
A. CnH2n
B. CnH2n−2
C. CnH2n+2
D. CnHn
Answer: C. CnH₂n+₂
Open-chain saturated hydrocarbons follow the alkane formula CnH₂n+₂.
11. Which is a primary alcohol?
A. 2-Propanol
B. tert-Butanol
C. Ethanol
D. 2-Butanol
Answer: C. Ethanol
The carbon bearing the hydroxyl group is attached to only one other carbon.
12. Which compound contains a carbonyl group?
A. Alkane
B. Aldehyde
C. Alkene
D. Alkyne
Answer: B. Aldehyde
An aldehyde contains a carbon-oxygen double bond at the end of a carbon chain.
13. What is the hybridization of carbon in ethene?
A. sp
B. sp²
C. sp³
D. d²sp³
Answer: B. sp²
Each carbon in ethene forms three sigma bonds and one pi bond.
14. Which molecule exhibits cis-trans isomerism?
A. Ethane
B. Ethene
C. Methane
D. Propane
1. Which atom is most electronegative?
A. Carbon
B. Nitrogen
C. Oxygen
D. Hydrogen
Answer: C. Oxygen
Oxygen has a higher electronegativity than carbon, nitrogen, and hydrogen, making it more effective
at attracting shared electrons.
2. What is the hybridization of carbon in methane (CH₄)?
A. sp
B. sp²
C. sp³
D. dsp²
Answer: C. sp³
Carbon forms four equivalent sigma bonds in methane, requiring sp³ hybridization and a tetrahedral
geometry.
3. The bond angle in an sp²-hybridized carbon is approximately:
A. 109.5°
B. 180°
C. 120°
D. 90°
Answer: C. 120°
sp² hybridization produces trigonal planar geometry with bond angles near 120°.
4. Which bond is strongest?
A. C–C
B. C=C
C. C≡C
D. All equal
Answer: C. C≡C
Triple bonds contain one sigma and two pi bonds, resulting in the greatest bond strength.
5. What is the molecular formula of benzene?
,A. C₆H₁₂
B. C₆H₆
C. C₆H₈
D. C₅H₆
Answer: B. C₆H₆
Benzene consists of six carbons and six hydrogens arranged in an aromatic ring.
6. Which functional group defines alcohols?
A. Carbonyl
B. Hydroxyl
C. Carboxyl
D. Amino
Answer: B. Hydroxyl
Alcohols contain the hydroxyl (–OH) functional group attached to carbon.
7. Which compound is an alkane?
A. Ethene
B. Ethyne
C. Ethanol
D. Ethane
Answer: D. Ethane
Alkanes contain only single carbon-carbon bonds; ethane is the simplest example after methane.
8. Which intermolecular force is strongest?
A. London dispersion
B. Dipole-dipole
C. Hydrogen bonding
D. Van der Waals
Answer: C. Hydrogen bonding
Hydrogen bonding is a particularly strong dipole interaction involving H bonded to N, O, or F.
9. What is the IUPAC name of CH₃CH₂CH₃?
A. Methane
B. Ethane
C. Propane
D. Butane
Answer: C. Propane
The molecule contains three carbon atoms in a continuous chain.
, 10. The general formula for alkanes is:
A. CnH2n
B. CnH2n−2
C. CnH2n+2
D. CnHn
Answer: C. CnH₂n+₂
Open-chain saturated hydrocarbons follow the alkane formula CnH₂n+₂.
11. Which is a primary alcohol?
A. 2-Propanol
B. tert-Butanol
C. Ethanol
D. 2-Butanol
Answer: C. Ethanol
The carbon bearing the hydroxyl group is attached to only one other carbon.
12. Which compound contains a carbonyl group?
A. Alkane
B. Aldehyde
C. Alkene
D. Alkyne
Answer: B. Aldehyde
An aldehyde contains a carbon-oxygen double bond at the end of a carbon chain.
13. What is the hybridization of carbon in ethene?
A. sp
B. sp²
C. sp³
D. d²sp³
Answer: B. sp²
Each carbon in ethene forms three sigma bonds and one pi bond.
14. Which molecule exhibits cis-trans isomerism?
A. Ethane
B. Ethene
C. Methane
D. Propane
