Q. Which of the following is a characteristic reaction of alkanes?
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A.
Nucleophilic substitution
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B.
Electrophilic addition
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C.
Free radical halogenation
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D.
Hydrogenation
Solution
Free radical halogenation is a characteristic reaction of alkanes.
Correct Answer: C — Free radical halogenation
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Q. Which of the following is the molecular formula for butane?
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A.
C3H8
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B.
C4H10
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C.
C5H12
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D.
C6H14
Solution
Butane has the molecular formula C4H10.
Correct Answer: B — C4H10
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Q. Which of the following is the simplest alkane?
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A.
Methane
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B.
Ethane
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C.
Propane
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D.
Butane
Solution
Methane (CH4) is the simplest alkane, consisting of one carbon atom.
Correct Answer: A — Methane
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Q. Which of the following reactions is characteristic of alkanes?
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A.
Electrophilic substitution
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B.
Nucleophilic substitution
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C.
Free radical substitution
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D.
Addition reaction
Solution
Alkanes undergo free radical substitution reactions, especially in the presence of halogens.
Correct Answer: C — Free radical substitution
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Q. Which of the following statements about alkanes is true?
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A.
They are highly reactive.
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B.
They are saturated hydrocarbons.
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C.
They contain double bonds.
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D.
They are polar molecules.
Solution
Alkanes are saturated hydrocarbons, meaning they contain only single bonds between carbon atoms.
Correct Answer: B — They are saturated hydrocarbons.
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