Photo-induced dissociation of 1,2-diiodoethane to ethene I₂+ hv ¹21.; 2 21+wall →surface-bound I₂; C₂H²I₂+I∙— ³ >C₂HÂI·+I₂; 4 C₂H₂IC₂H₂ +I.. a) What stage of the radical chain corresponds to these reactions: initiation, termination, or ropagation?
Photo-induced dissociation of 1,2-diiodoethane to ethene I₂+ hv ¹21.; 2 21+wall →surface-bound I₂; C₂H²I₂+I∙— ³ >C₂HÂI·+I₂; 4 C₂H₂IC₂H₂ +I.. a) What stage of the radical chain corresponds to these reactions: initiation, termination, or ropagation?
Organic Chemistry
8th Edition
ISBN:9781305580350
Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Chapter16: Aldehydes And Ketones
Section: Chapter Questions
Problem 16.63P
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![3. Photo-induced dissociation of 1,2-diiodoethane to ethene
I, + hv >2I·;
2
21.+wall
→surface-bound I, ;
C,H,I, +I-- >C,H̟I·+I, ;
>C,H, +I•.
3
4
C,H,I-
a) What stage of the radical chain corresponds to these reactions: initiation, termination, or
propagation?
b) Find the rate of consumption of I2, and the rate of production of ethene. Assume that all
radical species are very reactive. How would you define the length of the radical chain?
c) How much will the rate of ethene production change if the gas pressure is increased
twice? If the light intensity is increased twice? How will this rate change qualitatively if you
add to the mixture an aerosol of the same material from which the wall is made?
d) Let the initial concentration of I2 be significantly lower than that of C2H4I2, so that for
the initial period of the reaction [C2H4I2] can be assumed constant. Integrate the production rate
of I2 to find [I2](t). Sketch your solution.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3d213237-0562-457e-a3c4-9a5b202e14d4%2F7ce9a675-a00e-4188-b8ce-8eb179b4d1b0%2F8luzb1n_processed.png&w=3840&q=75)
Transcribed Image Text:3. Photo-induced dissociation of 1,2-diiodoethane to ethene
I, + hv >2I·;
2
21.+wall
→surface-bound I, ;
C,H,I, +I-- >C,H̟I·+I, ;
>C,H, +I•.
3
4
C,H,I-
a) What stage of the radical chain corresponds to these reactions: initiation, termination, or
propagation?
b) Find the rate of consumption of I2, and the rate of production of ethene. Assume that all
radical species are very reactive. How would you define the length of the radical chain?
c) How much will the rate of ethene production change if the gas pressure is increased
twice? If the light intensity is increased twice? How will this rate change qualitatively if you
add to the mixture an aerosol of the same material from which the wall is made?
d) Let the initial concentration of I2 be significantly lower than that of C2H4I2, so that for
the initial period of the reaction [C2H4I2] can be assumed constant. Integrate the production rate
of I2 to find [I2](t). Sketch your solution.
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