Hydrocarbons: Alkanes, Alkenes, Alkynes - Real World Applications
Q. What is the correct IUPAC name for CH3-CH2-CH=CH2?
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A.
Butene
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B.
1-Butene
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C.
2-Butene
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D.
Propene
Solution
The compound CH3-CH2-CH=CH2 is named 1-butene, as the double bond is located between the first and second carbon atoms.
Correct Answer: B — 1-Butene
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Q. What is the main functional group present in alkenes?
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A.
Alcohol
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B.
Aldehyde
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C.
Alkene
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D.
Alkyne
Solution
The main functional group in alkenes is the alkene group, characterized by a carbon-carbon double bond.
Correct Answer: C — Alkene
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Q. What is the main use of alkenes in the industry?
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A.
Fuel
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B.
Plastics production
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C.
Solvents
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D.
Detergents
Solution
Alkenes are primarily used in the production of plastics, such as polyethylene and polypropylene.
Correct Answer: B — Plastics production
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Q. What is the product of the complete combustion of ethyne (C2H2)?
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A.
C2H4 + H2O
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B.
CO2 + H2O
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C.
C2H6 + O2
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D.
C2H2 + O2
Solution
The complete combustion of ethyne produces carbon dioxide (CO2) and water (H2O).
Correct Answer: B — CO2 + H2O
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Q. What type of isomerism is exhibited by 1-butene and 2-butene?
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A.
Structural isomerism
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B.
Geometric isomerism
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C.
Optical isomerism
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D.
Conformational isomerism
Solution
1-butene and 2-butene exhibit geometric isomerism due to the different spatial arrangements of the substituents around the double bond.
Correct Answer: B — Geometric isomerism
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Q. What type of isomerism is exhibited by butene (C4H8)?
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A.
Structural isomerism
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B.
Geometric isomerism
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C.
Optical isomerism
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D.
Conformational isomerism
Solution
Butene exhibits geometric isomerism due to the presence of a double bond, allowing for cis and trans configurations.
Correct Answer: B — Geometric isomerism
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Q. Which of the following is a real-world application of alkenes?
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A.
Fuel production
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B.
Plastic manufacturing
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C.
Food preservation
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D.
Medicinal chemistry
Solution
Alkenes are widely used in the manufacturing of plastics, such as polyethylene and polypropylene.
Correct Answer: B — Plastic manufacturing
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Q. Which of the following is the correct IUPAC name for 2-methylpropene?
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A.
2-methylprop-1-ene
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B.
3-methylprop-1-ene
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C.
2-methylbut-1-ene
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D.
1-methylbut-2-ene
Solution
The correct IUPAC name for 2-methylpropene is 2-methylprop-1-ene, indicating the position of the double bond.
Correct Answer: A — 2-methylprop-1-ene
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Q. Which reaction mechanism is primarily involved in the addition of HBr to propene?
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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 addition of HBr to propene occurs via an electrophilic addition mechanism, where the double bond acts as a nucleophile.
Correct Answer: A — Electrophilic addition
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