WorksheetsReactions of Alkanes
Total questions: 24
Worksheet time: 24mins
What is the condition needed for substitution reaction with chlorine?
presence of sunlight
presence of red light
presence of UV light
all of the above
What type of chemical reaction is this:
C3H8 + Br2 ⟶ C3H7CBr + HBr
Incomplete combustion
Hydrogenation
Complete combustion
Free radical substitution
Which of the following is true about incomplete combustion?
It takes place because there is too much fuel
It takes place because there is not enough supply of air
The products are soot and hydrocarbons
The products are hydrogen and water
Give the name of reaction, when alkanes react with bromine in the presence of UV.
Hydrogenation
Halogenation
Hydration
Hydrohalogenation
What happened if alkane reacts with limited oxygen?
Produced carbon dioxide and water
Produced carbon monoxide and water
Produced oxygen and water
Produced soot and water
What is the name of this step?
Termination Step
Propagation Step
Initiation Step
Cleavage Step
Which of the following shows a propagation step?
What is the type of cleavage that occurs in the initiation step when a halogen is exposed to UV light?
Heterolytic fission
Hoholytic fission
Homoterolytic fission
Homolytic fission
Which equation represents a termination step?
Which equation is a propagation step in the conversion of chloromethane into dichloromethane by reaction with chlorine in the presence of ultraviolet light?
CHCl3 + Cl2 ⟶ CCl4 + HCl
●CH2Cl + ●Cl ⟶ CH2Cl2
CH3Cl + ●Cl ⟶ CH2Cl2 + ●H
●CH2Cl + Cl2 ⟶ CH2Cl2 + ●Cl
Which species is produced in a propagation step during the reaction of propane with an excess of chlorine in the presence of UV light?
H•
C3H5Cl
C3H7Cl
C6H14
Which one of the following is NOT a propagation reaction between methane and chlorine?
CH4 + Cl• → CH3• + HCl
CH3• + Cl• → CH3Cl + H•
CH3• + Cl2 → CH3Cl + Cl•
CH3Cl + Cl• → CH2Cl• + HCl
Pick the CORRECT statement for the chlorination of alkane.
The initiation step involves the attack of chlorine radicals on alkane
Sunlight supplies energy for the breaking of C-H bonds in methane
Chlorine radicals are produced by light catalysed fission
Chlorine radicals are generated again in the termination step
Which of the following is a free radical substitution reaction?
A. Hydrolysis of alkanes
B. Halogenation of alkanes
C. Hydrogenation of alkanes
D. Combustion of alkanes
Propane, C3H8, undergoes incomplete combustion in a limited amount of air. Which products are most likely to be formed during this reaction?
Carbon monoxide and water
Carbon monoxide and hydrogen
Carbon dioxide and hydrogen
Carbon dioxide and water
What is the mechanism of the reaction between ethane and chlorine in sunlight?
Free radical substitution
Free radical addition
Electrophilic substitution
Electrophilic addition
Which step is this in the synthesis of chloroalkanes?
Termination
Initiation
Propagation
Position
A particle with an unpaired electron:
Ion
Nucleophile
Free Radical
Neutrophile
The following image is an example of:
Elimination Reaction
Free Radical Substitution Reaction
Nucleophilic Substitution Reaction
No reaction
Which equation is a propagation step in the conversion of trichloromethane into tetrachloromethane by reaction with chlorine in the presence of ultraviolet light?
CHCl3 + Cl2 ⟶ CCl4 + HCl
●CCl3 + ●Cl ⟶ CCl4
CHCl3 + ●Cl ⟶ CCl4 + ●H
●CCl3 + Cl2 ⟶ CCl4 + ●Cl
The function of uv in the reaction of alkane with bromine is to
break the covalent bond between Br atoms.
provide energy to start the reaction.
start the heterolytic cleaveage.
ease the reaction.
Which of the following would have the highest boiling point?
C3H8
C4H8
C5H12
C22H44
State the general formula for alkane
CnH2n+2
CnH2n
CnH2n+1
CnH2n-2
What is the function of UV or heat during a free radical substitution reaction?
To provide color for homolytic cleavage
To provide energy for homolytic cleavage
To provide color for heterolytic cleavage
To provide energy for heterolytic cleavage
