How was Chemistry 42?

[terry jefferson]

it was ok....but messed up......i guess 24 hours are up so i think we can discuss.........what was the answer to the NMR spectroscopy??....what compound did you get?....also the question about the colour of the transitional complexes?....and the equilibria question too.....what was the type of reaction where the huge organic compound was split??.....damn too many doubts

 

[percolatormalwa]

The brits couldnt even print the nmr Peaks properly. That made it really confusing. But thank god i completed the paper with 15mins in hand. so the compound had an arene,an acid group and an amide group too

 

[percolatormalwa]

Hey, many found it hard, but I guess the ones who found it easy are on their study desks and not here. So the thresholds can't be predicted.

i think the gt should be 60. i am not a nerd but i didnt face problems in the paper as such

 

[littlecloud11]

The brits couldnt even print the nmr Peaks properly. That made it really confusing. But thank god i completed the paper with 15mins in hand. so the compound had an arene,an acid group and an amide group too

The compound was an arene but it didnt have an acid or amide group. It was a benzene ring with a -CH2-Cl group and an -OH group attached to it.

 

[ganapathynar]

yes that is correct

 

[fathimaash]

The compound was an arene but it didnt have an acid or amide group. It was a benzene ring with a -CH2-Cl group and an -OH group attached to it.

Yess its ryt...

 

[ganapathynar]

what was that NaOH hot and cold question?

 

[fathimaash]

I think it's 3 and 4 moles although I wrote it 3 and 3 :/

 

[Jinkglex]

idk if it couldve been arene...arene with OH attached would've gone far off deshielded to 9-10 PPM? :/ Khair im sure mine isnt right either so chill hi hai

With cold NAOH only the COOH would react, with hot NAOH COOH and 2 benzene OH would react and hydrolysis also.

 

[Jinkglex]

with NH3 the copper solution would go from light blue to light blue ppt to deep blue solution

 

[Jinkglex]

idk if light blue ppt is important to list or not, but since it was aqeous an intermediate of Cu[h2o]2[nh3]4 would be formed....

also the split happens because of dz2 and dx2-y2 which are close to bonding pairs causing them to go to higher energy level, whereas these orbitals are not present in s-orbital compounds.

for drugs the monomer was i think di-carboxyl group acid and the joining/cross-link forming compound was di-hydroxyl compound.

for NMR questions idk the compound but Cl was element, and 7 carbon atoms.

 

[fathimaash]

idk if light blue ppt is important to list or not, but since it was aqeous an intermediate of Cu[h2o]2[nh3]4 would be formed....

also the split happens because of dz2 and dx2-y2 which are close to bonding pairs causing them to go to higher energy level, whereas these orbitals are not present in s-orbital compounds.

for drugs the monomer was i think di-carboxyl group acid and the joining/cross-link forming compound was di-hydroxyl compound.

for NMR questions idk the compound but Cl was element, and 7 carbon atoms.

Yes I wrote the same thing but my compound had a benzene ring with a OH and a CH2Cl. Was it a condensation r addition polymerisation? ?

 

[Jinkglex]

condensation. He gave it away by saying small molecule is formed [which is h20 btw]

 

[ganapathynar]

I think it's 3 and 4 moles although I wrote it 3 and 3 :/

Yah i figured out it was 3 and 4 moles after the exam, however i wrote 3 and 7

 

[fathimaash]

condensation. He gave it away by saying small molecule is formed [which is h20 btw]

Evn I wrote condensation and dn watr but many othrs said it ws addition.

Yah i figured out it was 3 and 4 moles after the exam, however i wrote 3 and 7

 

[ganapathynar]

condensation. He gave it away by saying small molecule is formed [which is h20 btw]

But that question was for the cross linking not the actual compound. I wrote Condensation by mistake

 

[ganapathynar]

i thought all the OH's react with hot and the ester bond

 

[littlecloud11]

It was addition. The polymer was formed by addition and the side links by condensation to form ester. That's why a small molecule was eliminated.

 

[fathimaash]

Wat ws da answer for the qus wer they askd fr da reagents and condition to convert it to a nitrobenzene??

 

[Jinkglex]

i cant recall whether he was asking about the cross links or polymer...but if it was addition how come he never showed us any double bonds :/