Q. What is the main product when ethene reacts with water in the presence of an acid? (2023)
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A.
Ethanol
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B.
Ethane
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C.
Acetic acid
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D.
Ethylene glycol
Solution
The reaction of ethene with water in the presence of an acid yields ethanol.
Correct Answer: A — Ethanol
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Q. What is the molecular formula of cyclohexane? (2022)
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A.
C6H12
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B.
C6H10
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C.
C6H14
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D.
C6H6
Solution
Cyclohexane is a cyclic alkane with the formula C6H12.
Correct Answer: A — C6H12
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Q. What is the molecular formula of ethyne? (2022)
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A.
C2H2
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B.
C2H4
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C.
C2H6
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D.
C3H4
Solution
Ethyne, also known as acetylene, has the molecular formula C2H2.
Correct Answer: A — C2H2
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Q. What is the molecular formula of the simplest alkyne? (2022)
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A.
C2H2
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B.
C2H4
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C.
C3H4
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D.
C3H6
Solution
The simplest alkyne is ethyne (acetylene) with the molecular formula C2H2.
Correct Answer: A — C2H2
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Q. What type of bond is present in alkynes? (2022)
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A.
Single bond
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B.
Double bond
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C.
Triple bond
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D.
Quadruple bond
Solution
Alkynes contain at least one triple bond between carbon atoms.
Correct Answer: C — Triple bond
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Q. Which of the following compounds has a triple bond? (2022)
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A.
Ethylene
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B.
Acetylene
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C.
Propylene
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D.
Butane
Solution
Acetylene (C2H2) contains a triple bond between the two carbon atoms.
Correct Answer: B — Acetylene
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Q. Which of the following compounds is a branched alkane? (2022)
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A.
C5H12
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B.
C4H10
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C.
C3H8
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D.
C2H6
Solution
C5H12 can exist as both straight-chain (pentane) and branched (isopentane) forms.
Correct Answer: A — C5H12
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Q. Which of the following compounds is a cyclic alkane? (2022)
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A.
Cyclopropane
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B.
Butene
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C.
Hexane
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D.
Pentene
Solution
Cyclopropane is a cyclic alkane with three carbon atoms in a ring.
Correct Answer: A — Cyclopropane
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Q. Which of the following is a characteristic of aromatic hydrocarbons? (2023)
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A.
They are saturated
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B.
They have a pleasant smell
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C.
They are highly reactive
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D.
They contain double bonds only
Solution
Aromatic hydrocarbons are known for their pleasant smell and contain a stable ring structure.
Correct Answer: B — They have a pleasant smell
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Q. Which of the following is a cyclic hydrocarbon? (2019)
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A.
Cyclohexane
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B.
Hexane
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C.
Octane
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D.
Decane
Solution
Cyclohexane is a cyclic hydrocarbon with a ring structure.
Correct Answer: A — Cyclohexane
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Q. Which of the following is the simplest alkene? (2021)
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A.
Ethylene
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B.
Propylene
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C.
Butylene
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D.
Pentylene
Solution
Ethylene (C2H4) is the simplest alkene, containing a double bond between two carbon atoms.
Correct Answer: A — Ethylene
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