how was chemistry paper 22

[SB29597]

is there any chiral center ????

Nope

 

[SB29597]

nh3+h20====== Hno3+h2??????

NH4+ and OH-

 

[qffdhruba]

is there any chiral center ????

No, There was no chiral center....

 

[SB29597]

I got 65 % :'(

Wow

 

[qffdhruba]

LOL @ SB29597 exactly

btw what equation did you use to explain weak base?? nh3+ h20-> nh4+ +oh-? this one.

also what was the ester answer at the end, what is the identity of R? ethanoic acid??

yeh...it was ethanoic acid.....
tho i got tht wrong...:/
and yeh......thts the equation u have to give....along with how it partially ionizes and disassociates in the aqueous form.....thus setting up a equilibrium which lies to the right....

 

[Parsa Quazi]

What is the organic product when METHANOIC acid is heated under reflux with acidified potassium dichromate(vi) ?

 

[hela]

WHAT WILL BE THE MOST LIKELY QUESTION FOR PAPER31 SUMMER 2013

 

[no.mercy]

There was a chiral carbon.

 

[Aamer Faiyaz]

what was the mark for no.4 a? The one with the box with organic reactions? :l and was there really a chiral center?

 

[Aamer Faiyaz]

and does anyone remember the full no.4 question? after the box? even little bits? kinda forgot :s

 

[Gimmick]

Wait for 24 hours before discussing. There are still a few hours remaining, I'm sure you guys can wait that long...

 

[s_hithappens]

there was no chiral carbon (at least i hope there wasnt cuz thats what i wrote)

after the box in no.4, they asked for the structural formula of the compound formed when the crotyl alcohol ( or something like that) reacted with PCl5, i think it was probably the OH replaced by Cl. after that, there was a skeletal formula for an aldehyde, calculating empirical formula which came C7H14O for me (not sure if this is correct)

 

[Saadman]

This was an easy paper, but I made so many careless mistakes! I think I'm going to get 40s or so

Practice hard for paper 12, that'll help you increase your overall marks! =)

 

[s_hithappens]

WHAT WILL BE THE MOST LIKELY QUESTION FOR PAPER31 SUMMER 2013

there will be titration and lots of moles calculations, and ion test

 

[Saadman]

there was no chiral carbon (at least i hope there wasnt cuz thats what i wrote)

after the box in no.4, they asked for the structural formula of the compound formed when the crotyl alcohol ( or something like that) reacted with PCl5, i think it was probably the OH replaced by Cl. after that, there was a skeletal formula for an aldehyde, calculating empirical formula which came C7H14O for me (not sure if this is correct)

yup. OH is replaced by a Cl. Don't remember my empirical formula.

 

[Saadman]

what was the mark for no.4 a? The one with the box with organic reactions? :l and was there really a chiral center?

No Chiral Centre was present. (Y)

 

[Aamer Faiyaz]

yeah it was C7H14O for me. lost around 6 marks for silly mistakes! :l but does anyone remember the mark for no.4a box organic question?

 

[s_hithappens]

i think the total mark was 11 or something

 

[Rvzie]

91.236%

 

[Aamer Faiyaz]

can someone tell me what the mass of NaNO3 was? I got 2.30g at first but then I redid it and got 1.4ish grams