chem p12...hmm that was a tough one !!!

[sakibfaiyaz]

@Hassam: I too chose D for Q.40
Btw what do you chose for Q.29? The one about the change in chiral atoms. I strongly believe its B ; +1, -1
What was your answer to the Nitrogen question, about the redox? I chose A :S

 

[hassam]

same as u sakib its +1 and -1....see people here know that OH gets oxidised bt till then chose +2

 

[Sannikutti]

@hessam
i said it was D
from beginning
scroll to older post
ehm ehm

 

[hassam]

d was +1 and -1 ryt???

 

[sakibfaiyaz]

What was the answer to this one?

 

[Sannikutti]

where u got that paper from???

 

[EzioAuditre]

we r talkin abt butandoic wala in whch there were 3 options??

 

[sakibfaiyaz]

Edited the old one

 

[Sannikutti]

hahahaha
so sakib
which one u think it is??????

 

[EzioAuditre]

the reaction was dfrnt this time i am sure

 

[hassam]

A

 

[sakibfaiyaz]

I think it should be A.
Nitrogen undergoes a redox reaction, where it itself is reduced (+3 to 0) and oxdises NaOH.
If both oxidation and redox were to happen on nitrogen it would be disproportion.

 

[Sannikutti]

hmmmm ok irote same answer
and what about the q 40
and the boltzman disturbution curve????

 

[sakibfaiyaz]

for 40 I gave D...
And boltzman: I gave Higer Lower Lower

 

[Sannikutti]

what about the number of isomers of C5H10
and the compound which react with k2cr2o7 which form compound with no chirality

 

[sakibfaiyaz]

the change in Chiral was +2 and -1.. since the secondary OH will be oxidised to =0 leaving the cholestrol with one less chiral.

DUDE IT WAS +1 AND -1....u said manganate oxidises OH ryt....so y +2 then it must be +1....dont tell me cold doesnt oxidise cos i never saw that thing anywhere

Hassam I hope you are right, cause my chemistry teacher too said that cold dilute manganate ions wont oxidise SECONDARY alcohol. But I never saw this written anywhere, infact as far as i know Potassiun Manganate is a stronger OA than potassium dichromate, so it would oxidise it regardless of the condition. But yea then again, if it truly doesnt while in cold and DOES when hot then that is simply out of the scope of the syllabus! :S

 

[Sannikutti]

sakib
i think it does oxidize
uknow kmno4 is stronger OA than k2cr2o7
btw can u answer my questions
!!!!!

 

[sakibfaiyaz]

@sannikutti: I gave D for chirality....As in only 1 would give a chiral compound.
and no of isomers with pi bond= 5

 

[Sannikutti]

is the chirality one is the one in part B rite?
and what about the chiral carbons in that structure which they gave in the table form
lik it was +2,0 +2,-1 and alll that???/

 

[Astarstudent]

hey u guys..what was ur answer for question 2. the one about showing ionic and dative bond..
is dative bond shown by arrows only (choice A) or shown by lone pair and arrow (choice C).
thanks