Alkyl Group (Part - 8) - Organic Chemistry: Some Basic Principals & Techniques, Class 11 Video Lecture

hello friends this video on organic
chemistry basic part 8 is walk you by
example calm no more fear from exam
let's understand the alkyl group now
before we understand the naming
convention of the branching so alkyne
group are nothing but small carbon chain
of branches so if you see in the
branching compounds we have small chain
of carbon and - for example in this case
we have this come this attached so in
this we have this is one chain and this
is one attached these are my alpha equal
to BC this is a branch chain and here
small chains of carbons are - this small
chain of carbon understand right
and these are my alkyl groups to derive
our group you do one thing just from a
saturated hydrocarbon for example
methane I have ch4 remove one hydrogen
get ch3 right this is my alpha T or you
have C 2 H 6 in this you remove one
hydrogen you get C 2 H Phi correct so if
you see this is C 2 H 5 this is a branch
of this alkyl group is al-qaeda's
archive so okay or something but in the
branch chain you have a small chain of
carbon that is my alkyl group and to
wait or Chi group you take a saturated
please known to take a saturated
hydrocarbon and from that you remove
hydrogen correct for example if you see
from mithy and you get methane from
Ethan's is the thing again we design
this propane
3 carbon all substance this from
propagating it profile from butane you
get bit time from this is 10 carbon 1
plus 8 this is 8 this is 1 again 10 they
came to get the guy so to name this
compound the steps are very simple you
have to just add I to the ki-rin alkane
so mithya McCann's with high anything
becomes in time
propane nichols profile guten became
pile painting became pentile and the
list continues correct example this is
isopropyl
this is sec you time because I so do
time this is the shape
see I so what is given him it has two CS
three attached so you see this
carbon-carbon I'm talking mode has to
CSV attached to it is I so if it has one
CS 3 8 s it is called SEC example this
government but what about has one CSC a
task with high group again if you see
this carbon has two CS three right so it
is also ISO if carbon has GCS 3
she's got tetra Butte I odd move it
right also that does not the naming
conventions get right it is n cute I'll
if it is a strange change example ch3
ch3 ch2 this is n 4 pi correct if it is
it has branch it has 1 1 CH 3 it is sick
it has 2 CS 3 it is I so it has 3 CS
latest - it correct so 0 cs3 attached it
is N 1 cs3 attached it is sick - cs3
attached it is ISO and three maximum
three can be - it is he use the word
dirt or this is how you name the alkyl
group correct so let's start the
nomenclature of aliphatic compounds with
the doubt function group but this time
which is the branching so please pay
attention here because this is a little
long would the first models we had find
the longest chain the longest chain has
to be fine defined and if multiple bond
exists it must be part of the chain
right there is a multiple bond it has to
be part of them she the first students
find the longest chain the second is the
numbering is done for the carbon in such
a way that the branched carbon atoms get
the universe possible number please note
here the priority is for the branch
carbon atom there is alkyl groups that
is linked to this chain since we are
talking about the branch so
the peyote make sure branches lowest
number right and if two substituent are
formed in the equivalent position the
lower number is given the one is coming
in alphabetical listing example with
higher grade a high profile I just wrote
in the alphabetical listing e f g h i j
k l m n o p a-- so ethyl will be given
more importance than with higher than
provide high because they are following
the alphabetical or right so he tied has
more important than we find then goodbye
so it doesn't depend on the number of
carbon it depends only in the
alphabetical order right so if it has
more than one similar high group example
it has two methyl from extreme inside
route then you will goose die to
maternal trying for three with a
curvature and also note that this
numbing my talked about alphabetic order
so there we don't use we don't consider
this died trying this we only consider
methyl alcohol in Kyle alcohol profile
it is died try those words are not
considered when you talk about
alphabetical listing me earlier consider
border it high provider in due time
we will discuss this one by one we'll
take some examples to understand this
and then if the alkyl group is further
branch then it is again named as
substituted alkyl we'll take an example
to understand this then will it be all
the rules once again the first thing is
you find the longest chain with multiple
bonds it exists numbering is done to
make sure the branching is the lowest
number right and if there is a conflict
will use the alphabetical order for the
alkyl group and please use di-in't why
don't you consider this Diane trial word
in the alphabetical listing only child
methyl profile this ordered before and
the al-khatib itself is a big branch
then you use the name a as a substitute
alkyne
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