Hydrocarbons: Alkanes, Alkenes, Alkynes - Numerical Applications
Q. What is the IUPAC name for the compound CH3-CH=CH-CH2-CH3?
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A.
1-Pentene
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B.
2-Pentene
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C.
3-Pentene
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D.
Butene
Solution
The compound is named 2-pentene because the double bond is located between the second and third carbon atoms.
Correct Answer: B — 2-Pentene
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Q. What is the IUPAC name for the compound with the formula C5H12?
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A.
Pentane
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B.
Butane
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C.
Hexane
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D.
Propane
Solution
The compound C5H12 is an alkane with five carbon atoms, which is named pentane.
Correct Answer: A — Pentane
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-C≡C-CH3?
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A.
1-Pentyne
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B.
2-Pentyne
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C.
3-Pentyne
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D.
Butyne
Solution
The compound is named 2-pentyne because the triple bond is located between the second and third carbon atoms.
Correct Answer: B — 2-Pentyne
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Q. What is the IUPAC name of the compound with the formula C5H12?
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A.
Pentane
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B.
Butane
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C.
Hexane
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D.
Propane
Solution
The compound C5H12 is an alkane with five carbon atoms, which is named pentane.
Correct Answer: A — Pentane
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Q. What is the major product of the reaction between 1-butyne and H2 in the presence of a catalyst?
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A.
Butane
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B.
Butene
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C.
Cyclobutane
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D.
1-Butyne
Solution
The hydrogenation of 1-butyne in the presence of a catalyst produces butane as the major product.
Correct Answer: A — Butane
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Q. What is the molecular formula for 3-methyl-1-butyne?
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A.
C5H10
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B.
C5H8
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C.
C6H10
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D.
C6H12
Solution
3-methyl-1-butyne has the molecular formula C5H8, as it contains a triple bond.
Correct Answer: B — C5H8
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Q. What is the product of the complete combustion of 2-butyne?
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A.
C4H10 + CO2 + H2O
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B.
C4H10 + CO + H2O
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C.
CO2 + H2O
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D.
C4H8 + O2
Solution
The complete combustion of 2-butyne produces carbon dioxide (CO2) and water (H2O).
Correct Answer: C — CO2 + H2O
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Q. What is the product of the reaction between ethene and bromine?
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A.
Bromoethane
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B.
1,2-Dibromoethane
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C.
Ethane
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D.
Ethyl bromide
Solution
The reaction between ethene and bromine results in the formation of 1,2-dibromoethane through an electrophilic addition mechanism.
Correct Answer: B — 1,2-Dibromoethane
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Q. What is the product of the reaction of 2-pentyne with water in the presence of sulfuric acid?
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A.
2-Pentanol
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B.
3-Pentanol
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C.
Pentanal
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D.
Pentanoic acid
Solution
The hydration of 2-pentyne in the presence of sulfuric acid leads to the formation of 3-pentanol.
Correct Answer: B — 3-Pentanol
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Q. Which of the following is the correct formula for an alkane?
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A.
C_nH_{2n}
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B.
C_nH_{2n+2}
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C.
C_nH_{2n-2}
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D.
C_nH_{2n+1}OH
Solution
The general formula for alkanes is C_nH_{2n+2}, where n is the number of carbon atoms.
Correct Answer: B — C_nH_{2n+2}
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