Master Aliphatic Hydrocarbons with targeted 12th Class Chemistry Chapter 8 MCQs. Cover essential topics like alkanes, alkenes, and alkynes, along with their reactions. Trending terms like hydrocarbon MCQs, alkane quiz, and organic chemistry tests ensure competitive readiness.
Aliphatic hydrocarbons are compounds that mainly consist of:
a) Carbon and hydrogen
b) Carbon and oxygen
c) Carbon and nitrogen
d) Carbon and sulfur
Aliphatic hydrocarbons can be classified into two main groups: alkanes and:
a) Alkenes
b) Alkynes
c) Aromatic hydrocarbons
d) Alcohols
Alkanes are also known as:
a) Saturated hydrocarbons
b) Unsaturated hydrocarbons
c) Aromatic hydrocarbons
d) Aromatics
The general formula of alkanes is:
a) CnH2n
b) CnH2n+2
c) CnH2n-2
d) CnH2n+4
Alkanes contain only:
a) Single bonds
b) Double bonds
c) Triple bonds
d) Aromatic rings
The simplest alkane is:
a) Methane
b) Ethane
c) Propane
d) Butane
The molecular formula of methane is:
a) CH2
b) C2H4
c) C3H6
d) CH4
The molecular formula of ethane is:
a) CH2
b) C2H4
c) C3H6
d) CH4
The molecular formula of propane is:
a) CH2
b) C2H4
c) C3H6
d) CH4
The molecular formula of butane is:
a) CH2
b) C2H4
c) C3H6
d) C4H10
Which of the following is an example of an alkane?
a) Ethene
b) Propene
c) Butane
d) Benzene
Alkenes are unsaturated hydrocarbons that contain:
a) Only single bonds
b) Only double bonds
c) Both single and double bonds
d) Only triple bonds
The general formula of alkenes is:
a) CnH2n
b) CnH2n+2
c) CnH2n-2
d) CnH2n+4
The simplest alkene is:
a) Ethene
b) Propene
c) Butene
d) Hexene
The molecular formula of ethene is:
a) CH2
b) C2H4
c) C3H6
d) CH4
The molecular formula of propene is:
a) CH2
b) C2H4
c) C3H6
d) CH4
The molecular formula of butene is:
a) CH2
b) C2H4
c) C3H6
d) C4H8
The molecular formula of hexene is:
a) CH2
b) C2H4
c) C6H12
d) CH4
Alkynes are unsaturated hydrocarbons that contain:
a) Only single bonds
b) Only double bonds
c) Both single and double bonds
d) Only triple bonds
The general formula of alkynes is:
a) CnH2n
b) CnH2n+2
c) CnH2n-2
d) CnH2n+4
The simplest alkyne is:
a) Ethyne
b) Propyne
c) Butyne
d) Hexyne
The molecular formula of ethyne is:
a) CH2
b) C2H4
c) C3H6
d) C2H2
The molecular formula of propyne is:
a) CH2
b) C3H4
c) C3H6
d) C2H2
The molecular formula of butyne is:
a) CH2
b) C3H4
c) C3H6
d) C4H6
The molecular formula of hexyne is:
a) CH2
b) C4H6
c) C6H10
d) C6H12
Which of the following is an example of an alkyne?
a) Ethene
b) Propene
c) Butene
d) Ethyne
Which of the following aliphatic hydrocarbons is used as fuel for heating and cooking?
a) Ethane
b) Propane
c) Butane
d) Ethene
Aliphatic hydrocarbons are classified as open-chain compounds because their carbon atoms form:
a) Cyclic structures
b) Aromatic rings
c) Double bonds
d) Straight or branched chains
The carbon-carbon double bond in alkenes is formed by the sharing of:
a) One pair of electrons
b) Two pairs of electrons
c) Three pairs of electrons
d) Four pairs of electrons
The carbon-carbon triple bond in alkynes is formed by the sharing of:
a) One pair of electrons
b) Two pairs of electrons
c) Three pairs of electrons
d) Four pairs of electrons
The carbon-carbon single bond in alkanes allows for:
a) Free rotation around the bond axis
b) Restricted rotation around the bond axis
c) No rotation around the bond axis
d) Formation of double bonds
Which of the following is a characteristic property of alkanes?
a) They undergo addition reactions.
b) They are highly reactive.
c) They do not react with acids.
d) They readily undergo combustion.
Which of the following is a characteristic property of alkenes?
a) They undergo addition reactions.
b) They are highly reactive.
c) They do not react with acids.
d) They readily undergo combustion.
Which of the following is a characteristic property of alkynes?
a) They undergo addition reactions.
b) They are highly reactive.
c) They do not react with acids.
d) They readily undergo combustion.
The process of converting alkanes into alkenes by breaking carbon-carbon single bonds is called:
a) Substitution
b) Addition
c) Hydrogenation
d) Dehydrogenation
The process of converting alkenes into alkanes by adding hydrogen across the carbon- carbon double bond is called:
a) Substitution
b) Addition
c) Hydrogenation
d) Dehydrogenation
Which of the following is used as a test for unsaturation in organic compounds?
a) Bromine water test
b) Silver mirror test
c) Tollens’ test
d) Fehling’s test
The reaction between alkenes and bromine water results in the decolorization of the solution due to:
a) Reduction of bromine
b) Oxidation of bromine
c) Formation of an insoluble precipitate
d) Formation of a soluble complex
Which of the following is a common industrial process for producing alkenes from alkanes?
a) Dehydration
b) Hydrogenation
c) Cracking
d) Halogenation
Which of the following processes involves the breaking down of larger hydrocarbon molecules into smaller ones?
a) Dehydration
b) Hydrogenation
c) Cracking
d) Halogenation
Alkynes can undergo hydrogenation to form:
a) Alkanes
b) Alkenes
c) Cycloalkanes
d) Alcohols
The process of converting alkynes into alkenes by breaking carbon-carbon triple bonds is called:
a) Substitution
b) Addition
c) Hydrogenation
d) Dehydrogenation
The reaction between alkynes and bromine water results in the decolorization of the solution due to:
a) Reduction of bromine
b) Oxidation of bromine
c) Formation of an insoluble precipitate
d) Formation of a soluble complex
Aliphatic hydrocarbons are important constituents of:
a) Fats and oils
b) Proteins and enzymes
c) Nucleic acids
d) Aromatic compounds
The prefix “eth-” in ethane indicates that the molecule contains:
a) One carbon atom
b) Two carbon atoms
c) Three carbon atoms
d) Four carbon atoms
Which of the following hydrocarbons is found in natural gas and is used as a fuel?
a) Ethane
b) Propane
c) Butane
d) Methane
Which of the following hydrocarbons is used as a refrigerant and aerosol propellant?
a) Ethane
b) Propane
c) Butane
d) Methane
The hydrocarbon “but-2-ene” contains:
a) One double bond
b) Two double bonds
c) One triple bond
d) Two triple bonds
The hydrocarbon “hex-3-yne” contains:
a) One double bond
b) Two double bonds
c) One triple bond
d) Two triple bonds
Which of the following hydrocarbons is the main component of natural gas and is known for its odorless and highly flammable properties?
a) Ethane
b) Propane
c) Butane
d) Methane
The prefix “prop-” in propane indicates that the molecule contains:
a) One carbon atom
b) Two carbon atoms
c) Three carbon atoms
d) Four carbon atoms
The prefix “but-” in butane indicates that the molecule contains:
a) One carbon atom
b) Two carbon atoms
c) Three carbon atoms
d) Four carbon atoms
Which of the following is a common use of alkenes?
a) Fuel for heating and cooking
b) Refrigerant and aerosol propellant
c) Production of plastics and polymers
d) Component of natural gas
Which of the following is a common use of alkynes?
a) Fuel for heating and cooking
b) Refrigerant and aerosol propellant
c) Production of plastics and polymers
d) Component of natural gas
Which of the following hydrocarbons is used as a raw material in the production of ethylene, a widely used industrial chemical?
a) Ethane
b) Propane
c) Butane
d) Methane
The prefix “prop-” in propene indicates that the molecule contains:
a) One carbon atom
b) Two carbon atoms
c) Three carbon atoms
d) Four carbon atoms
The prefix “but-” in butene indicates that the molecule contains:
a) One carbon atom
b) Two carbon atoms
c) Three carbon atoms
d) Four carbon atoms
The prefix “pent-” in pentene indicates that the molecule contains:
a) One carbon atom
b) Two carbon atoms
c) Three carbon atoms
d) Five carbon atoms
The prefix “hex-” in hexene indicates that the molecule contains:
a) One carbon atom
b) Two carbon atoms
c) Three carbon atoms
d) Six carbon atoms
The prefix “hept-” in heptyne indicates that the molecule contains:
a) One carbon atom
b) Two carbon atoms
c) Three carbon atoms
d) Seven carbon atoms
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