L15 : Alcohol test - Alcohol, Phenol & Ether, Chemistry, Class 12 Video Lecture - Class 12 | Best Video for Class 12

hello friends this video on alcohol
phenol and ether part 15 is brought you
by exam fear calm no more fear from exam
now in the lab some time it is required
to find where the alcohol is primary
secondary or tertiary for that we will
use three tests based on whatever we
have learnt in now what is oxidations
test you have seen that primary
secondary interest real call behaves
differently depending on the alcohol
right
dehydration test this also we have seen
that it behaves differently right
primary secondary and tertiary and then
we have lucasz test that also we have
seen that ability which you get the
speed at which you get the turbidity is
different based on the families you can
be in tertiary alcohols let's see the
oxidation just see oxidation we have
seen that if I have primary alcohol if I
am one degree alcohol if I do oxidation
and let me make it our ch2 voyage what
you get is RC which that is aldehyde it
further to oxidation
you get RC o H that is my acid hey say
we see carbon count is same same carbon
come right it also same come let us do
it for two degree of calm so let's
suppose I have something like this we do
oxidation I get something like this that
is my ketone this will also have same
color but if you see it ISM you don't
know this was my aunty height this is my
acid this is a keto do further oxidation
will get order co h right back our only
you can get it - these are - right
so you see this carbon is less
right because one is gone actually from
here carbon is less here the same carbon
so you see this reaction is a little
different so here you are getting Rd
hides a keto right and in this case you
are getting carboxylic acid the same
carbon here you are getting a simple the
list number of carbon let's try for
tertiary you have our R I cos u
oxidation sanely it doesn't work but
under extreme conditions only this
happens and you give you cute oh here oh
so ABC les come from heavenly chemical
it is a keto for three days and here it
will be the same process it will again
be less so these observation you can
tell that whether a particular call is
primary secondary or tertiary the next
is dehydrogenation test when the alcohol
is reduced so it is not reduced we use
reduced copper and heat 573 Kelvin so if
you see here if I have primary alcohol
and if I use copper with the heat what
you get is aldehyde if I have secondary
alcohol if I use copper with 573 Kelvin
what you get is kedo if I have tertiary
alcohol at suppose I let me add ch3
because it will be alkene right if I use
copper the same temperature what you get
is alkene and this you can easily and if
I using bromine water test right so this
is my aldehyde this is my ketone is
mildly
this mother 1 degree 2 degree n tricky
so if you see using my dehydrogenation
test also we can tell whether it's
sublime using in your tush the next is
the Lucas test we've already learned
this regards what you do you take
alcohol you react this with HCl in the
presence of Jenin siendo you get our X
now the type of every and appearance of
this rx decides whether it is primary
secondary or tertiary at 3 degrees the
fastest so if it is immediate immediate
reciprocation I will say it is 3d Leal
call if it is let's suppose three to
five to eight minutes let's suppose in
this frame it will be 2 degree alcohol
and if it is no precipitation at all it
is manually alcohol correct so because
you can actually differentiate into the
desert primary secondary or tertiary
alcohol thank you visit our website exam
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