Unsaturated Hydrocarbon MCQ Quiz - Objective Question with Answer for Unsaturated Hydrocarbon - Download Free PDF

The correct answer is Alkenes and alkynes are unsaturated hydrocarbons..

Key Points

• Unsaturated hydrocarbons are organic compounds that contain double or triple bonds between carbon atoms.
• Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C=C).
• Alkynes are hydrocarbons that contain at least one carbon-carbon triple bond (C≡C).
• Examples of alkenes include ethylene (C2H4) and propylene (C3H6).
• Examples of alkynes include acetylene (C2H2) and propyne (C3H4).

Additional Information

• Saturated hydrocarbons (alkanes) only contain single bonds between carbon atoms and are fully saturated with hydrogen atoms.
• Alkenes and alkynes are more reactive than alkanes due to the presence of double and triple bonds, which have higher energy and are more chemically reactive.
• Unsaturated hydrocarbons can undergo addition reactions, where atoms or groups of atoms are added to the carbon atoms involved in the double or triple bonds.
• Hydrogenation is a chemical process where unsaturated hydrocarbons are converted to saturated hydrocarbons by adding hydrogen (H2).
• Unsaturated hydrocarbons play a crucial role in the chemical industry, including the production of polymers, pharmaceuticals, and other organic compounds.

The correct answer is C2H2.

Key Points

• Ethyne, also known as acetylene, is a hydrocarbon and the simplest alkyne with the chemical formula C2H2.
• It consists of two carbon atoms triple-bonded to each other, with each carbon also bonded to one hydrogen atom.
• This compound is widely used in welding and cutting due to its high flame temperature when burned with oxygen.
• Ethyne is a colorless gas with a slight garlic-like odor, detectable at concentrations above 100 ppm.

Additional Information

• Alkynes
  • Alkynes are hydrocarbons with at least one carbon-carbon triple bond.
  • The general formula for alkynes is CnH2n-2, indicating two fewer hydrogens than alkanes.
  • They are unsaturated compounds, making them more reactive than alkanes and alkenes.
• Uses of Ethyne
  • Used in oxyacetylene welding and cutting due to its high flame temperature.
  • Serves as a precursor for synthesizing various organic chemicals.
  • Used in the production of polymers like polyvinyl chloride (PVC).
• Properties of Ethyne
  • Colorless gas with a slightly sweet odor.
  • Highly flammable and can form explosive mixtures with air.
  • Soluble in organic solvents like acetone and benzene.
• Safety Precautions
  • Store in a well-ventilated area away from sources of ignition.
  • Use appropriate personal protective equipment when handling.
  • Ensure proper ventilation when using in confined spaces to avoid accumulation.

The correct answer is C3H8.

Key Points

• C3H8 is the chemical formula for propane, which is a saturated hydrocarbon.
• Saturated hydrocarbons contain only single bonds between carbon atoms.
• Propane is an alkane, which is a type of saturated hydrocarbon.
• Alkanes have the general formula CnH2n+2, and propane (C3H8) fits this formula.

Additional Information

• Saturated Hydrocarbons:
  • Saturated hydrocarbons are hydrocarbons in which all the carbon atoms are connected by single bonds. They are also known as alkanes.
  • Alkanes have the general formula CnH2n+2, where n is the number of carbon atoms.
  • Examples include methane (CH4), ethane (C2H6), and propane (C3H8).
• Unsaturated Hydrocarbons:
  • Unsaturated hydrocarbons contain at least one double or triple bond between carbon atoms.
  • Alkenes are hydrocarbons with one or more double bonds (general formula CnH2n), such as ethene (C2H4) and propene (C3H6).
  • Alkynes are hydrocarbons with one or more triple bonds (general formula CnH2n-2), such as ethyne (C2H2) and propyne (C3H4).
• Benzene (C6H6):
  • Benzene is an aromatic hydrocarbon, characterized by a ring of six carbon atoms with alternating double bonds.
  • Aromatic hydrocarbons have unique stability and properties due to their conjugated pi-electron systems.
• Hydrocarbon Classes:
  • Hydrocarbons can be classified into alkanes (saturated), alkenes (unsaturated), alkynes (unsaturated), and aromatic hydrocarbons.
  • Each class has distinct chemical properties and reactivities.

The correct answer is yellow.Key Points

• When unsaturated hydrocarbons burn, they produce a yellow flame due to the presence of carbon particles in the flame.
• Unsaturated hydrocarbons are hydrocarbons that contain at least one double or triple bond between carbon atoms in their molecular structure.
• Some examples of unsaturated hydrocarbons include alkenes and alkynes.

Additional Information

• Blue is the color of the flame when alkanes, which are saturated hydrocarbons, burn.
  • This is because alkanes do not contain double or triple bonds and produce a complete combustion reaction.
• Red and green flames are typically produced by burning metals or metal salts.
• It is important to note that the color of the flame produced by burning hydrocarbons can also be affected by other factors, such as the presence of impurities or the amount of oxygen available for combustion.

The correct answer is Compounds of carbon having double bonds or triple bonds between their carbon atoms are called unsaturated compounds.Key Points

• Compounds of carbon having double bonds or triple bonds between their carbon atoms are called unsaturated compounds.
• The term "unsaturated" means more hydrogen atoms may be added to the hydrocarbon to make it saturated (i.e. consisting of all single bonds).
• The example of the unsaturated compound is alkenes and alkynes, as well as branched chains and aromatic compounds.
• Saturated hydrocarbons have the molecular formula C_nH_2n+2, where n refers to the number of carbon atoms, and can be any natural number.
  • For example ethane

Additional Information

• Alkane - acyclic saturated hydrocarbon.
  • Alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon-carbon bonds are single.
• Alkene - any hydrocarbon containing one or more double bonds.
  • Alkenes unsaturated compounds
• Alkyne - any hydrocarbon containing one or more triple bonds.
  • Alkenes unsaturated compounds

The correct answer is Compounds of carbon having double bonds or triple bonds between their carbon atoms are called unsaturated compounds.Key Points

• Compounds of carbon having double bonds or triple bonds between their carbon atoms are called unsaturated compounds.
• The term "unsaturated" means more hydrogen atoms may be added to the hydrocarbon to make it saturated (i.e. consisting of all single bonds).
• The example of the unsaturated compound is alkenes and alkynes, as well as branched chains and aromatic compounds.
• Saturated hydrocarbons have the molecular formula C_nH_2n+2, where n refers to the number of carbon atoms, and can be any natural number.
  • For example ethane

Additional Information

• Alkane - acyclic saturated hydrocarbon.
  • Alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon-carbon bonds are single.
• Alkene - any hydrocarbon containing one or more double bonds.
  • Alkenes unsaturated compounds
• Alkyne - any hydrocarbon containing one or more triple bonds.
  • Alkenes unsaturated compounds

The correct answer is yellow.Key Points

• When unsaturated hydrocarbons burn, they produce a yellow flame due to the presence of carbon particles in the flame.
• Unsaturated hydrocarbons are hydrocarbons that contain at least one double or triple bond between carbon atoms in their molecular structure.
• Some examples of unsaturated hydrocarbons include alkenes and alkynes.

Additional Information

• Blue is the color of the flame when alkanes, which are saturated hydrocarbons, burn.
  • This is because alkanes do not contain double or triple bonds and produce a complete combustion reaction.
• Red and green flames are typically produced by burning metals or metal salts.
• It is important to note that the color of the flame produced by burning hydrocarbons can also be affected by other factors, such as the presence of impurities or the amount of oxygen available for combustion.

The correct answer is Compounds of carbon having double bonds or triple bonds between their carbon atoms are called unsaturated compounds.Key Points

• Compounds of carbon having double bonds or triple bonds between their carbon atoms are called unsaturated compounds.
• The term "unsaturated" means more hydrogen atoms may be added to the hydrocarbon to make it saturated (i.e. consisting of all single bonds).
• The example of the unsaturated compound is alkenes and alkynes, as well as branched chains and aromatic compounds.
• Saturated hydrocarbons have the molecular formula C_nH_2n+2, where n refers to the number of carbon atoms, and can be any natural number.
  • For example ethane

Additional Information

• Alkane - acyclic saturated hydrocarbon.
  • Alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon-carbon bonds are single.
• Alkene - any hydrocarbon containing one or more double bonds.
  • Alkenes unsaturated compounds
• Alkyne - any hydrocarbon containing one or more triple bonds.
  • Alkenes unsaturated compounds

The correct answer is yellow.Key Points

• When unsaturated hydrocarbons burn, they produce a yellow flame due to the presence of carbon particles in the flame.
• Unsaturated hydrocarbons are hydrocarbons that contain at least one double or triple bond between carbon atoms in their molecular structure.
• Some examples of unsaturated hydrocarbons include alkenes and alkynes.

Additional Information

• Blue is the color of the flame when alkanes, which are saturated hydrocarbons, burn.
  • This is because alkanes do not contain double or triple bonds and produce a complete combustion reaction.
• Red and green flames are typically produced by burning metals or metal salts.
• It is important to note that the color of the flame produced by burning hydrocarbons can also be affected by other factors, such as the presence of impurities or the amount of oxygen available for combustion.

The correct answer is C3H8.

Key Points

• C3H8 is the chemical formula for propane, which is a saturated hydrocarbon.
• Saturated hydrocarbons contain only single bonds between carbon atoms.
• Propane is an alkane, which is a type of saturated hydrocarbon.
• Alkanes have the general formula CnH2n+2, and propane (C3H8) fits this formula.

Additional Information

• Saturated Hydrocarbons:
  • Saturated hydrocarbons are hydrocarbons in which all the carbon atoms are connected by single bonds. They are also known as alkanes.
  • Alkanes have the general formula CnH2n+2, where n is the number of carbon atoms.
  • Examples include methane (CH4), ethane (C2H6), and propane (C3H8).
• Unsaturated Hydrocarbons:
  • Unsaturated hydrocarbons contain at least one double or triple bond between carbon atoms.
  • Alkenes are hydrocarbons with one or more double bonds (general formula CnH2n), such as ethene (C2H4) and propene (C3H6).
  • Alkynes are hydrocarbons with one or more triple bonds (general formula CnH2n-2), such as ethyne (C2H2) and propyne (C3H4).
• Benzene (C6H6):
  • Benzene is an aromatic hydrocarbon, characterized by a ring of six carbon atoms with alternating double bonds.
  • Aromatic hydrocarbons have unique stability and properties due to their conjugated pi-electron systems.
• Hydrocarbon Classes:
  • Hydrocarbons can be classified into alkanes (saturated), alkenes (unsaturated), alkynes (unsaturated), and aromatic hydrocarbons.
  • Each class has distinct chemical properties and reactivities.

The correct answer is Alkenes and alkynes are unsaturated hydrocarbons..

Key Points

• Unsaturated hydrocarbons are organic compounds that contain double or triple bonds between carbon atoms.
• Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C=C).
• Alkynes are hydrocarbons that contain at least one carbon-carbon triple bond (C≡C).
• Examples of alkenes include ethylene (C2H4) and propylene (C3H6).
• Examples of alkynes include acetylene (C2H2) and propyne (C3H4).

Additional Information

• Saturated hydrocarbons (alkanes) only contain single bonds between carbon atoms and are fully saturated with hydrogen atoms.
• Alkenes and alkynes are more reactive than alkanes due to the presence of double and triple bonds, which have higher energy and are more chemically reactive.
• Unsaturated hydrocarbons can undergo addition reactions, where atoms or groups of atoms are added to the carbon atoms involved in the double or triple bonds.
• Hydrogenation is a chemical process where unsaturated hydrocarbons are converted to saturated hydrocarbons by adding hydrogen (H2).
• Unsaturated hydrocarbons play a crucial role in the chemical industry, including the production of polymers, pharmaceuticals, and other organic compounds.

The correct answer is C2H2.

Key Points

• Ethyne, also known as acetylene, is a hydrocarbon and the simplest alkyne with the chemical formula C2H2.
• It consists of two carbon atoms triple-bonded to each other, with each carbon also bonded to one hydrogen atom.
• This compound is widely used in welding and cutting due to its high flame temperature when burned with oxygen.
• Ethyne is a colorless gas with a slight garlic-like odor, detectable at concentrations above 100 ppm.

Additional Information

• Alkynes
  • Alkynes are hydrocarbons with at least one carbon-carbon triple bond.
  • The general formula for alkynes is CnH2n-2, indicating two fewer hydrogens than alkanes.
  • They are unsaturated compounds, making them more reactive than alkanes and alkenes.
• Uses of Ethyne
  • Used in oxyacetylene welding and cutting due to its high flame temperature.
  • Serves as a precursor for synthesizing various organic chemicals.
  • Used in the production of polymers like polyvinyl chloride (PVC).
• Properties of Ethyne
  • Colorless gas with a slightly sweet odor.
  • Highly flammable and can form explosive mixtures with air.
  • Soluble in organic solvents like acetone and benzene.
• Safety Precautions
  • Store in a well-ventilated area away from sources of ignition.
  • Use appropriate personal protective equipment when handling.
  • Ensure proper ventilation when using in confined spaces to avoid accumulation.

A triple bond in chemistry is a chemical bond between two atoms involving six bonding electrons instead of the usual two in a covalent single bond. The most common triple bond that exists is between two carbon atoms and can be found in alkynes.