Hydrocarbons: Alkanes, Alkenes, Alkynes - Higher Difficulty Problems
Q. What is the expected product when 1-butyne undergoes hydroboration-oxidation?
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A.
1-butanol
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B.
2-butanol
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C.
butanal
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D.
butyric acid
Solution
Hydroboration-oxidation of 1-butyne leads to the formation of 2-butanol due to anti-Markovnikov addition.
Correct Answer: B — 2-butanol
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Q. What is the IUPAC name for the compound CH3-CH2-CH(CH3)-C≡C-CH2-CH3?
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A.
3-heptyne
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B.
2-heptyne
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C.
4-heptyne
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D.
1-heptyne
Solution
The longest carbon chain containing the triple bond has 7 carbons, and the triple bond starts at carbon 3, making it 3-heptyne.
Correct Answer: A — 3-heptyne
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Q. What is the IUPAC name for the compound with the formula C6H10 that contains a double bond?
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A.
1-hexene
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B.
2-hexene
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C.
cyclohexene
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D.
3-hexene
Solution
C6H10 can be a cyclic compound with a double bond, making it cyclohexene.
Correct Answer: C — cyclohexene
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Q. What is the major product of the reaction of 1-butyne with HBr?
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A.
1-bromobutane
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B.
2-bromobutane
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C.
butane
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D.
bromobenzene
Solution
The reaction of 1-butyne with HBr follows Markovnikov's rule, leading to the formation of 2-bromobutane.
Correct Answer: B — 2-bromobutane
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Q. What is the product of the complete combustion of ethyne (acetylene)?
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A.
CO2 and H2O
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B.
C and H2O
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C.
CO and H2O
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D.
C2H4
Solution
The complete combustion of ethyne produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — CO2 and H2O
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Q. What is the product of the hydrogenation of 2-pentyne?
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A.
pentane
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B.
2-pentene
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C.
1-pentene
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D.
3-pentene
Solution
The hydrogenation of 2-pentyne will fully saturate the triple bond, resulting in pentane.
Correct Answer: A — pentane
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Q. Which of the following is the correct IUPAC name for 3-methyl-1-pentyne?
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A.
3-methyl-1-pentyne
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B.
2-methyl-1-pentyne
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C.
1-methyl-3-pentyne
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D.
1-methyl-2-pentyne
Solution
The compound has a triple bond at the first carbon and a methyl group at the third carbon, making it 3-methyl-1-pentyne.
Correct Answer: A — 3-methyl-1-pentyne
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Q. Which of the following is the correct mechanism for the hydration of an alkene?
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A.
Electrophilic addition
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B.
Nucleophilic substitution
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C.
Radical substitution
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D.
Elimination
Solution
The hydration of an alkene occurs via an electrophilic addition mechanism, where the alkene acts as a nucleophile.
Correct Answer: A — Electrophilic addition
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Q. Which of the following is the correct stereochemical configuration for 2-butene?
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A.
cis
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B.
trans
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C.
both cis and trans
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D.
neither cis nor trans
Solution
2-butene can exist as both cis and trans isomers due to the presence of a double bond between the second and third carbons.
Correct Answer: C — both cis and trans
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