Test Bank for Organic Chemistry 9th
Edition by L. G. Wade Jr, Jan William
Simek
Organic Chemistry Practice Test Bank —
Questions
1. Which type of hybridization is present in a carbon atom in methane
(CH₄)?
A. sp
B. sp²
C. sp³
D. sp³d
Correct Answer: C
Rationale:
Methane has four sigma bonds; carbon undergoes sp³ hybridization.
2. Which of the following compounds is aromatic?
A. Cyclohexane
B. Benzene
C. Cyclopentene
D. Butane
Correct Answer: B
Rationale:
Benzene is cyclic, planar, fully conjugated, and follows Huckel’s rule (4n+2 π electrons).
,3. The IUPAC name of CH₃CH₂OH is:
A. Methanol
B. Ethanol
C. Propanol
D. Butanol
Correct Answer: B
Rationale:
Two-carbon alcohol = ethanol.
4. Which is the strongest acid among the following?
A. CH₄
B. NH₃
C. HCl
D. H₂O
Correct Answer: C
Rationale:
HCl is a strong acid; it dissociates completely in water.
5. A nucleophile is defined as a species that:
A. Accepts electrons
B. Donates electrons
C. Accepts protons only
D. Forms radicals
Correct Answer: B
Rationale:
Nucleophiles are electron-rich species that donate electrons to electrophiles.
6. Which compound is a ketone?
A. CH₃CH₂OH
B. CH₃COCH₃
C. HCHO
D. CH₃CH₂NH₂
, Correct Answer: B
Rationale:
CH₃COCH₃ has a carbonyl group bonded to two carbons → ketone.
7. In SN2 reactions, the rate depends on:
A. Only the substrate concentration
B. Only the nucleophile concentration
C. Both substrate and nucleophile concentrations
D. Neither
Correct Answer: C
Rationale:
SN2 is bimolecular; rate = k[substrate][nucleophile].
8. Which is a stereoisomer of 2-butene?
A. 1-butene
B. cis-2-butene
C. Butane
D. Isobutane
Correct Answer: B
Rationale:
Cis-2-butene and trans-2-butene are stereoisomers (same connectivity, different geometry).
9. Markovnikov’s rule predicts:
A. Hydrogen adds to the more substituted carbon
B. Hydrogen adds to the less substituted carbon
C. Bromine adds to the more substituted carbon
D. No regioselectivity
Correct Answer: B
Rationale:
Hydrogen adds to the carbon with more hydrogens (less substituted) during electrophilic
addition.
Edition by L. G. Wade Jr, Jan William
Simek
Organic Chemistry Practice Test Bank —
Questions
1. Which type of hybridization is present in a carbon atom in methane
(CH₄)?
A. sp
B. sp²
C. sp³
D. sp³d
Correct Answer: C
Rationale:
Methane has four sigma bonds; carbon undergoes sp³ hybridization.
2. Which of the following compounds is aromatic?
A. Cyclohexane
B. Benzene
C. Cyclopentene
D. Butane
Correct Answer: B
Rationale:
Benzene is cyclic, planar, fully conjugated, and follows Huckel’s rule (4n+2 π electrons).
,3. The IUPAC name of CH₃CH₂OH is:
A. Methanol
B. Ethanol
C. Propanol
D. Butanol
Correct Answer: B
Rationale:
Two-carbon alcohol = ethanol.
4. Which is the strongest acid among the following?
A. CH₄
B. NH₃
C. HCl
D. H₂O
Correct Answer: C
Rationale:
HCl is a strong acid; it dissociates completely in water.
5. A nucleophile is defined as a species that:
A. Accepts electrons
B. Donates electrons
C. Accepts protons only
D. Forms radicals
Correct Answer: B
Rationale:
Nucleophiles are electron-rich species that donate electrons to electrophiles.
6. Which compound is a ketone?
A. CH₃CH₂OH
B. CH₃COCH₃
C. HCHO
D. CH₃CH₂NH₂
, Correct Answer: B
Rationale:
CH₃COCH₃ has a carbonyl group bonded to two carbons → ketone.
7. In SN2 reactions, the rate depends on:
A. Only the substrate concentration
B. Only the nucleophile concentration
C. Both substrate and nucleophile concentrations
D. Neither
Correct Answer: C
Rationale:
SN2 is bimolecular; rate = k[substrate][nucleophile].
8. Which is a stereoisomer of 2-butene?
A. 1-butene
B. cis-2-butene
C. Butane
D. Isobutane
Correct Answer: B
Rationale:
Cis-2-butene and trans-2-butene are stereoisomers (same connectivity, different geometry).
9. Markovnikov’s rule predicts:
A. Hydrogen adds to the more substituted carbon
B. Hydrogen adds to the less substituted carbon
C. Bromine adds to the more substituted carbon
D. No regioselectivity
Correct Answer: B
Rationale:
Hydrogen adds to the carbon with more hydrogens (less substituted) during electrophilic
addition.
