Lecture notes
An exam question on free radical substitution
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A step by step guide to answer the free radical substitution mechanism in a practice exam question.
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~ The refrigeran t R410A., used in air cood,Uoners, Is a mixture of two Ouoroa lkane s.~ pentafluoroethane and d ifluorom ethane.
(a ) (1) The mechan1sm for Lhe reaction o r fluorine with e ither an alkane or a nuo roaJkane Is
slmlJa r to th at ror the reaclfon of chlorine with methane.
-
Name lhe· type of m echanism for lhe reaction of chllorlne wilh methane.
~~o..Q~~-:U:~ --------
(1)
(it) W rite equa tions for the ·following steps in lhe mechanism for the reaction offtuorlne
with ffuoromethane (CH::tF) Lo form difluorom e ! f l a n ~ ,
I • • ·~ \\.\»~
Initiation step v>-01' ~
-r--w.J
lflcu.
•
Rk st propagation step : -fkc.lSY'l)
P~J~
Secondi propagation step
(
e Cl::\ 2: F ~ ·CJ-:\ 2: t ~ C l--U-:cJ::i 1> f
\-w~ c=~ , z. ~ Ll l)vc.ciuU V\l,\ ~~u (4)
~ ~
0 0
/iii\ Write sn overall eauation for the reaction of fluorine with ethane to form .\. \ - .. C
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