Preparation of Alkyl Halides by Halogen Exchange Video Lecture | Chemistry for JEE Main & Advanced

hello friends this video in haloalkanes
the hello arenas part 13 is brought to
you by exam Viacom no more fear from
exam let's understand a very interest
interesting type of reaction called
halogen exchange reaction so in this the
typical reaction is you have some
al-qaeda already haloalkane you react
with some salt halide salt Ashley then
you get R I and X so X can be here
chlorine although please note this is
the equilibrium reaction so very
critical point here equally VM reaction
because in this case right if let's
suppose X is chlorine so let's suppose
let's take this example C 2 H by CL
reacts with na I in here C 2 H by I plus
NaCl and this is the equilibrium
reaction because the reaction can move
in both direction right because it's
anyway I have it in exchange right so
here once it is in this phase iodine
chlorine can attack and kick off IOD a
and becomes C 2 H 5 CL once in the
situation why CL I think in a dark and
become situation if ni trades a
equilibrium reaction and this is also
called Finklestein reaction and the good
part about this reaction is it is
equilibrium reaction how to proceed so
it it is based on the solubility so we
know that sodium iodide is soluble in
acetone but sodium chloride or sodium
provide is not soluble in acetone all
right now the whole reaction takes place
in a solvent called Osito
so what happens here since sodium
provided is not soluble in acetone and
this is a clearing reaction it
precipitates out and you take this out
from reaction from the whole solvent
this is a tumbler away this I have a
acetone here and this reaction is going
on and this sodium crystals comes out
right and using some sheep or something
you take this out you take this out then
concentration of this is decreasing that
means the reaction will forward in the
possibly in the forward direction and
with this you are able to achieve this
correct please note this kind of
reaction is a equilibrium reaction also
called finger Liston reaction but the
way if in order to achieve the product
we take advantage of the solubility so
in this case we had seen that sodium
iodide is not soluble in acetone but
sodium chloride or sodium bromide is
soluble in acetone so what we do we
carry the whole reaction acetone sodium
chloride precipitates out we using
sheave or something we just take out the
sodium provide and thus the
concentration of sodium chloride is
decreasing so the reaction will move in
the forward direction so if you don't
understand why this reaction moved in
the forward action please watch my class
eleventh video on equilibrium where we
discussed how to take this equilibrium
reaction in the forward or backward
direction let's take some examples now
so the question is why sulfuric s is not
used in the reaction of alcohol with ki
as I told that ki is nothing but I - and
sulfuric acid is very strong acid it
will convert this into I - right so if
it is i - i - is not there and i - is
something critical right because this is
my nucleophile so if i use sulfuric acid
my nucleophile is exhausted symbol roh
if i react with ki and if I use h2 so4
my h2 so4 will eat this I - so AC of
h2so4 I'll use s3 three or four its
little weak acid and this will not eat
my islands
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