JEE Chemistry Club

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Gaurang Tandon

00:21

@Carrick yes it should be...

@Abcd the equation is not balanced ;P

2 hours later…

Avnish Kabaj

02:13

I'm getting 3 as the answer

The given answer is 6

Can anyone check?

Jasmine

02:35

@abcd actually i was initially trying to mark those which are definitely not chiral centre than i realised what am i doing. Then i marked the chiral centres

Gaurang Tandon

@AvnishKabaj i too got 6.07 approximately

Jasmine

Exam pressure. Simply there is O or N a chiral centre

Gaurang Tandon

@AvnishKabaj i think you missed the fact that the number of moles of FeO produced are double the initial moles of Fe2O3 taken

Jasmine

I mean the lone pair of n will be in resonance and so there wont be a chiral centre as there will be partial double bond character?

Please solve question 4.

Avnish Kabaj

03:20

@GaurangTandon Yesh thanks

Abcd

@GaurangTandon please tell me the mechanism...

Ignore equation balancing

Gaurang Tandon

@Abcd i think i would need to know what happened to the fourth carbon...how else would I know the mechanism?

Koolman

In this why OH- has attacked carbon 2 not carbon 2

And why the carboanion first attacked on the double why not on the carbonyl carbon

Gaurang Tandon

@Koolman OH- has abstracted acidic H atom from carbon 2. the anion thus formed does a 1,4-addition on the unsaturated ketone (masterorganicchemistry.com/tips/conjugate-addition)

Jasmine

Please someone solve q4 also i am waiting. @Abcd @GaurangTandon @Koolman

Gaurang Tandon

03:35

@Jasmine sorry, but I am too lazy to do that. If you want to understand the complete method, consult a standard physical chem book like Cengage, it has many such solved examples in it....

unless you have a specific query in that q4

Koolman

@GaurangTandon but in carbon 2 there is +I of methyl group so it should be less acidic

Jasmine

Yeah i wrote the equation we dont take inert gas in total pressure?

And even in kc

Gaurang Tandon

@Jasmine inert gas is not part of any equilibrium. total pressure = press of inert gas+press of equilibrium mixture.

Jasmine

Yeah still am not getting answer

Ok i will try it on my own

Gaurang Tandon

@Koolman to be honest, idk why in first step OH- abstract acidic H and not attack carbonyl. Probably that's because only the former step leads to the formation of a fused ring compound

@Jasmine if you don't get the answer, let me know what the correct answer is and i'll try to solve it

Jasmine

03:41

@GaurangTandoncan you once check for number of chiral centres in resperine

I think i did it correctly the chiral centre one so its ok

Gaurang Tandon

@Jasmine the sp2 hybrid N won't be a chiral center

Jasmine

Yeah so yotal 8 chiral centres

J_B892

04:26

Q: Is it possible to have negative bond orders?

In the MO theory, is it possible to have a molecule with bond order less than 0? The least bond order I have come across as of now is 0 (for di-atomic noble gases), indicating that the molecule cannot exist and the atoms get pulled apart. Is it possible to create a scenario (at least theoretical...