Hydrocarbons: Alkanes, Alkenes, Alkynes - Competitive Exam Level
Q. What is the major product of the hydration of propene in the presence of sulfuric acid?
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A.
Propan-1-ol
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B.
Propan-2-ol
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C.
Propanoic acid
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D.
Propyl sulfate
Solution
The major product of the hydration of propene is propan-2-ol due to Markovnikov's rule.
Correct Answer: B — Propan-2-ol
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Q. What is the molecular formula of 2,3-dimethylbutane?
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A.
C7H16
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B.
C6H14
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C.
C8H18
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D.
C5H12
Solution
2,3-dimethylbutane has a total of 7 carbon atoms and 16 hydrogen atoms, giving the formula C7H16.
Correct Answer: A — C7H16
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Q. What is the molecular formula of 2-butyne?
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A.
C4H6
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B.
C4H8
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C.
C4H10
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D.
C4H4
Solution
2-butyne has a triple bond and contains 4 carbons and 6 hydrogens, giving the formula C4H6.
Correct Answer: A — C4H6
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Q. Which of the following compounds is a functional group of alkenes?
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A.
-OH
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B.
-COOH
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C.
-C=C-
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D.
-C≡C-
Solution
The functional group of alkenes is the carbon-carbon double bond represented as -C=C-.
Correct Answer: C — -C=C-
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Q. Which of the following compounds is a structural isomer of butane?
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A.
2-methylpropane
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B.
1-butene
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C.
Cyclobutane
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D.
Pentane
Solution
2-methylpropane is a structural isomer of butane, having the same molecular formula but a different structure.
Correct Answer: A — 2-methylpropane
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Q. Which of the following is a characteristic of alkynes?
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A.
Contain only single bonds
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B.
Contain at least one triple bond
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C.
Are saturated hydrocarbons
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D.
Are cyclic compounds
Solution
Alkynes are characterized by the presence of at least one triple bond between carbon atoms.
Correct Answer: B — Contain at least one triple bond
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Q. Which of the following is the correct representation of cis-2-butene?
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A.
CH3-CH=CH-CH3
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B.
CH3-CH=CH-CH2
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C.
CH3-CH=CH-CH3
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D.
CH3-CH2-CH=CH2
Solution
Cis-2-butene has the two methyl groups on the same side of the double bond, represented as CH3-CH=CH-CH3.
Correct Answer: A — CH3-CH=CH-CH3
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Q. Which of the following is the correct structure for 1-hexene?
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A.
CH2=CH-CH2-CH2-CH2-CH3
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B.
CH3-CH2-CH2-CH=CH-CH3
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C.
CH3-CH=CH-CH2-CH2-CH3
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D.
CH3-CH2-CH=CH-CH2-CH3
Solution
1-hexene has a double bond between the first and second carbon atoms, represented as CH2=CH-CH2-CH2-CH2-CH3.
Correct Answer: A — CH2=CH-CH2-CH2-CH2-CH3
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Q. Which reaction mechanism is involved in the hydration of alkenes?
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A.
Electrophilic addition
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B.
Nucleophilic substitution
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C.
Free radical substitution
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D.
Elimination
Solution
The hydration of alkenes involves an electrophilic addition mechanism where water adds across the double bond.
Correct Answer: A — Electrophilic addition
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