Hydrocarbons
Q. What is the main product of the complete combustion of methane? (2023)
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A.
Carbon dioxide and water
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B.
Carbon monoxide and water
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C.
Carbon and hydrogen
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D.
Oxygen and water
Solution
The complete combustion of methane (CH4) produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — Carbon dioxide and water
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Q. What is the main product when ethene reacts with hydrogen in the presence of a catalyst?
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A.
Ethane
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B.
Ethanol
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C.
Ethyl chloride
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D.
Acetylene
Solution
The main product is ethane, formed by the hydrogenation of ethene.
Correct Answer: A — Ethane
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Q. What is the product of the complete combustion of propane?
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A.
CO2 and H2O
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B.
CO and H2O
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C.
C and H2
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D.
C2H4
Solution
The complete combustion of propane produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — CO2 and H2O
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Q. What type of bond is present in alkenes?
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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
Alkenes contain at least one double bond between carbon atoms.
Correct Answer: B — Double bond
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Q. What type of reaction occurs when ethene reacts with bromine?
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A.
Substitution
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B.
Addition
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C.
Elimination
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D.
Oxidation
Solution
The reaction between ethene and bromine is an addition reaction, forming dibromoethane.
Correct Answer: B — Addition
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Q. Which hydrocarbon has the highest boiling point?
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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
Butane has the highest boiling point among the given hydrocarbons due to its larger molecular size.
Correct Answer: D — Butane
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Q. Which hydrocarbon is used as a fuel in lighters?
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A.
Methane
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B.
Butane
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C.
Ethylene
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D.
Acetylene
Solution
Butane is commonly used as a fuel in lighters.
Correct Answer: B — Butane
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Q. Which of the following compounds is an unsaturated hydrocarbon? (2023)
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A.
C2H6
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B.
C3H8
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C.
C2H4
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D.
C4H10
Solution
C2H4 (ethylene) is an unsaturated hydrocarbon as it contains a double bond.
Correct Answer: C — C2H4
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Q. Which of the following hydrocarbons is saturated?
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A.
C2H2
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B.
C3H6
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C.
C4H10
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D.
C5H8
Solution
C4H10 (butane) is a saturated hydrocarbon, containing only single bonds.
Correct Answer: C — C4H10
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Q. Which of the following is a characteristic of unsaturated hydrocarbons?
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A.
Only single bonds
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B.
Contains double or triple bonds
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C.
Higher boiling points
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D.
Less reactive
Solution
Unsaturated hydrocarbons contain double or triple bonds, making them more reactive than saturated hydrocarbons.
Correct Answer: B — Contains double or triple bonds
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Q. Which of the following is a saturated hydrocarbon?
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A.
Ethylene
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B.
Acetylene
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C.
Cyclohexane
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D.
Benzene
Solution
Cyclohexane is a saturated hydrocarbon, containing only single bonds.
Correct Answer: C — Cyclohexane
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Q. Which of the following is an example of an alkane? (2023)
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A.
C2H4
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B.
C3H8
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C.
C4H6
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D.
C5H10
Solution
Alkanes are saturated hydrocarbons with the general formula CnH2n+2. C3H8 (propane) fits this formula.
Correct Answer: B — C3H8
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Q. Which of the following is an example of an alkyne?
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A.
Ethane
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B.
Propene
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C.
Butyne
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D.
Benzene
Solution
Butyne is an alkyne, characterized by a triple bond between carbon atoms.
Correct Answer: C — Butyne
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