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Lalit Tolani
Lalit Tolani
08:03
@all in PF3 is P sp3 hybridised or no hybridisation?
Wolgwang
Wolgwang
@LalitTolani sp3 hybridised I think.
Lalit Tolani
Lalit Tolani
08:20
@Wolgwang but bond angle is shown 96
@hansika what do you think
Wolgwang
Wolgwang
@LalitTolani Because of lone pair.
Lalit Tolani
Lalit Tolani
@Wolgwang what if there is no hybridisation and because of steric effects just there's little increase from 90
Wolgwang
Wolgwang
08:48
@LalitTolani Possible.
9
A: Why the bond angle of PH3 is lesser that that of PF3?

JanVSEPR works by accident in the cases of $\ce{NH3}$ and $\ce{NF3}$. In reality, there are much more things to consider as shown in this answer. All four compounds should have bond angles of $90^\circ$ if there were no other effects present. For both nitrogen compounds, the effects are the short $...

> For phosphorous, we can initially assume that the bond angle of $\ce{PH3}$ is close enough to $90^\circ$ for no hybridisation to be necessary (semi-proven by this answer of Martin) and likewise for $\ce{PF3}$.
Lalit Tolani
Lalit Tolani
Yes unhybridised it is
Wolgwang
Wolgwang
09:04
5
Q: Mechanism for acylation of benzene with succinic anhydride

Avyansh KatiyarI've just started with EAS. I wanted to write down a mechanism for acylation of a cyclic anhydride (for some reason the formation of the carbocation is not given in my textbook). So I wish to know whether this mechanism is correct or now. Since this is my first attempt at writing one, I don't kno...

organic-chemistry reaction-mechanism aromatic-compounds carbonyl-compounds
user image
Won't the oxygen atom in the middle attack the AlCl3?
NVM...In the dupe target the middle oxygen attacks.
Wolgwang
Wolgwang
user image
How to convert the final product to Naphthalene?
1
Q: Reactions on alpha tetralone to synthesize naphthalene

Moinak BanerjeeAlpha-Tetralone is reacted by $1.\ce{Zn(Hg),HCl}\ \ 2.\ce{ Pd/C}$ What is the product and mechanism that is followed for the 2nd reaction? A book by SN Sanyal says that Naphthalene will be produced . I know that in the 1st reaction, clemenson reduction is followed thereby reducing the Carbonyl g...

organic-chemistry organic-reduction
In which chapter will I learn aromatisation by Pd/C?
Lalit Tolani
Lalit Tolani
09:39
@all trisilylamine will be approx planar or completely planar?
approx planar it shuld be because there will be one tetrahedral resonating structure
Lalit Tolani
Lalit Tolani
10:00
@all What do you think about bond angle of C-O-C bond in ether, should it be less than 109
Wolgwang
Wolgwang
10:10
@LalitTolani Why do you think so?
 
2 hours later…
Ashish Ahuja
Ashish Ahuja
12:07
@Wolgwang Clemmensen/Wolf-kishner/Mozingo/catalytic hydrogenation (pd/pt + C) followed by either Pd/C + heat or Se + heat
aromatisation is covered in aromatic compounds in 12th I think
@LalitTolani it should be completely planar... I don't understand why you think it should only be approx planar?
@LalitTolani I believe it is greater than 109 because of steric clashes between the alkyl groups; I don't think its possible to theoretically predict the angle without computation anyway.
Yash Agrawal
Yash Agrawal
12:26
@LalitTolani C-O-C bond angle in methoxy methane is 111.7 according to NCERT
So nearly all ethers should have it greater than 109
 
1 hour later…
Lalit Tolani
Lalit Tolani
13:42
@AshishAhuja because of sp3 hybridised resonance structure
@YashAgrawal yes I checked that, here I think steric factors wins over the lone pair-lone pair repulsion
Yash Agrawal
Yash Agrawal
14:41
@LalitTolani but central atom and two groups would be anyways planar only
note that maximum no. of planar atoms in a tetrahedral geometry is 3 (C.A + any two surroundings)
Lalit Tolani
Lalit Tolani
15:03
@YashAgrawal So?
Ashish Ahuja
Ashish Ahuja
15:53
@LalitTolani well that way there would be a resonance structure of carbonic acid (h2co3) where the carbon has a negative charge, but you wouldn't say the carbonic acid is "approximately planar", would you?
There is a continuous d pi - p pi conjugation across trisilylamine, talking about certain extreme resonance structures is of little value.
Yash Agrawal
Yash Agrawal
16:07
@LalitTolani Ignore it , I interpreted something wrong
@LalitTolani resonating structures are only contribution to real structures , they themselves doesn't exist or remains in equilibrium , bond order is 4/3 b/w N and Si so it is simultaneously back bonding with all three Si , so electron density is distributed throughout
Lalit Tolani
Lalit Tolani
16:41
@AshishAhuja but sp3 hybridised nitrogen with three single bonded groups wouldn't be an extreme resonance structure , also negative charge on carbon with positive charge on oxygen wouldn't be least contributing
Ashish Ahuja
Ashish Ahuja
16:57
15
Q: Hybridization of nitrogen in trisilylamine, (SiH3)3N?

heyI want to know the hybridization of the central atom in $\ce{(SiH3)3N}$. I think it should be $\mathrm{sp^3}$, because $\ce{N}$ is attached to three silicon atoms and one lone pair. But actually it is supposedly $\mathrm{sp^2}$. How is this so?

inorganic-chemistry hybridization
looks like its not even d pi - p pi as I said it was.. I think this is beyond my understanding and I can't really help much, but I think thinking in terms of resonance structures here isn't very useful, because as the answer to the above question describes, the bonding isn't straightforward like the cases in which resonance is applied.
Lalit Tolani
Lalit Tolani
@AshishAhuja i think i am thinking too much
Yash Agrawal
Yash Agrawal
@LalitTolani problem with inorganic chemistry is that what theory is being taught isn't entirely correct So it can't explain all properties and behaviours of many compounds , so sometimes even giving reasons is merely an way to remember
Lalit Tolani
Lalit Tolani
@YashAgrawal yes you are right, even hybridisation is wrong and mot we have learnt is for diatomic molecules only
Yash Agrawal
Yash Agrawal
yes , best we can do is accept things at this stage ;(
Lalit Tolani
Lalit Tolani
17:22
@YashAgrawal yes

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