Which of these organic compounds would undergo free radical substitution?
I |
ethane |
II |
fluoroethane |
III |
ethene |
IV |
ethanal |
I only
I and II
I, II and III
All
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Syllabus Edition
First teaching 2023
First exams 2025
Which of these organic compounds would undergo free radical substitution?
I |
ethane |
II |
fluoroethane |
III |
ethene |
IV |
ethanal |
I only
I and II
I, II and III
All
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Which equation represents a correct propagation step in the free radical substitution reaction between ethane and chlorine?
C2H6 + Cl • → C2H5Cl + H•
C2H5• + Cl2 → C2H5Cl + Cl •
C2H6 + H• → C2H5• + HCl
C2H5• + Cl • → C2H5Cl
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Ultraviolet light initiates the following reaction.
alkane + chlorine → chloroalkane + hydrogen chloride
What happens to chlorine in this photochemical reaction?
heterolytic fission to give an electrophile
homolytic fission to give an electrophile
heterolytic fission to give a positive and negative ion
homolytic fission to give free radicals
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In the presence of ultraviolet light, ethane and chlorine react to give a mixture of products.
Which compound could be present in the mixture of products?
CH3Cl
CH3CH2CH2Cl
CH3CH2CH2CH3
CH3CH2CH2CH2CH3
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Which statements about the chlorine free radical are correct?
I and II only
I and III only
II and III only
I, II and III
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Which organic product does not form in the following reaction?
C2H6 + Cl2
C2H4Cl2
C2H5Cl
C4H10
Cl2
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Ethane reacts with bromine in the presence of ultraviolet light to form dibromoethane and hydrogen bromide.
The reaction proceeds via free radical substitution involving initiation, propagation and termination steps.
What is the minimum number of free radical mechanism steps to produce dibromoethane?
5
6
7
8
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Ethane reacts with chlorine in the presence of ultraviolet light to form trichloroethane and hydrogen chloride.
The reaction proceeds via free radical substitution involving initiation, propagation and termination steps.
Which propagation equation is involved in the free radical reaction to form trichloroethane?
C2H6 + Cl● → C2H6● + HCl
C2H3Cl2 + Cl● → C2H3Cl3 + H●
C2H5 + Cl2 → C2H5Cl + Cl●
C2H4Cl● + Cl2 → C2H4Cl2 + Cl●
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Ethane reacts with bromine in the presence of ultraviolet light to form tribromoethane and hydrogen bromide.
The reaction proceeds via free radical substitution involving initiation, propagation and termination steps.
Which equation represents a possible termination step in this reaction?
2C2H4● → C4H8
C2H4Br● + C2H5● → C4H9Br
C2H4● + C2H3Br● → C4H7Br
C2H3Br2● + C2H3Br● → C4H6Br3
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