L15 : Alkenes physical properties - Hydrocarbons, Class 11 Video Lecture

hello friends this video in hydrocarbons
part 15 is brought to you by exam fear
dot-com no more fear from exam now we
know how to prepare our keys let's
understand the properties of these we'll
talk about the physical properties will
talk about the modeling in building
Boyd's solubility we'll talk about
density let's talk about them physical
properties so alkenes is a class with
symbols with ultimate so alkanes almost
resemble and physical properties except
die symbolism this is different we
explain right they have different
because they have different polar nature
they have a different type of moment but
a part of that they almost have seen
physical properties if you see here we
have explained this thing actually this
ch3 ch3 here
cs3 here so this guy has a zero diaper -
right and this guy has some micro so
there's a difference this has more type
on this is zero equal to so this is one
difference I said I suppose that we have
different like I'll get their partial
polar because I'll tell you because see
if I have double bonds here I have
single bond here right so this double
bond is what SP this guy if you see this
will be sp2 hybridized this will be sp3
so if you know on sp2 it has more s
character this is less s characters
right this will be slightly more likely
electronegative right boil it is it will
have like negative shock slab slightly
positive charge and this we have seen in
the past video area talked about the
percentage s and possibly speak I to
send electronegativity of different
carbon source so slightly holders like
and they have many weak water one these
we force the first three members is see
to see people we are not considered
ch2 because there is very unstable the
the first three whereby the C 2 C 2 4 C
4 gases the next 14 is the liquids and
the high ones are waxy the back C is no
they're not sort of a wax the at my
channel temperature today this et is
colorless with a faint smell and the
other alkenes are colorless and odorless
fully if it has some smell or recover
this Ethan have some spin sweet spin but
others you don't have let's talk about
the boiling and melting point of this
alkies they are very low melting and
boiling point then this show a regular
increase the boiling and melting point
but increase in size every ch2 addition
you see the increase in boiling point by
yes since isomers have higher been
taking one right because it says you
have more dipole moment just example to
shake this guy it you see has more typo
and if you see the transfer the title is
almost used correct almost is you so
this is has fired Pentagon I will take
any more correct and like I'll gain this
in same thing the straight chains of the
alkenes will have higher boiling point
then the large so we talk about
solubility the see brutalize the like
dissolves like so they are able to be
less poorer so mostly they are nonpolar
so their installable water but if the
nonpolar solvents the amazing petroleum
they are solvable if you talk about
density is assembly train the density
increased but it becomes constant at 0.8
gram per city does the maximum density
of any bulky so then like them what
let's take some numerical of this
process and trans structural takes to me
and we have to say which
the higher boiling point why this draw
extreme x2 let's first drop one car them
this hex weight second carbon I have
double bond x2 mean this is what a
structure is right so let me now draw
the this is H here this is one structure
so let me talk structure so this is one
structure that I have here I have a then
I have c3h7 see thickness in the other
case or C 3 X 7 and C assuming together
in this package if you see this is my
sis
because my pants this has hired a dipole
correct both same side so in this case
dipole will cancel little bit this says
less tight so this guy's hired iPod so
this will have high so what a point
this guy has higher one thank you visit
exam Viacom to watch free educational
videos try free online tests get the
best quality study materials study from
the best tutors and mentors and much
more thanks the screen