paper 12 chemistry ...

[angelgirl:)]

can any1 tell me the answer for the equlibrium question with some detail calculation method?the one...(2+2/3)

 

[Ali23]

@angelgirl see previous cmnts....people sayin its B or D...but mine is C

 

[Ali23]

@bilal 1,2bromo sumthng for conine one ...its B

 

[AppleGreen]

@bilal 1,2bromo sumthng for conine one ...its B

No... it is D

 

[Henry930821]

You geta sodium salt and an alcohol. It was a simple stoichiometric calculation. Trust me, not 50-50!

This is right

 

[Henry930821]

No... it is D

Mind explaining?

 

[donorsolutions]

I too got the same answer 10.8 Kpa for the Pv =NRT Question

By the way whay was the answer to that question ( 2 + x/2 ) ?

For the equilibrium one it was D

 

[donorsolutions]

how it can be alchol...when it was written tht X will not react carboxtlic acid to make ester!! :/

that was a tertiary alcohol, they refluxed it with K2Cr2O7 , then it gave sodium with hydrogen, but didnt esterified with ethanol because it was an alcohol, it didnt reacted with 24 dinitro because tertiary alcohols are not oxidised. So in the end alcohol is the answer

 

[TheFahim94]

it was C !!

 

[donorsolutions]

it said in two steps. this becomes 3. first to aldehydes than to acid. and u need further heating for that. i think it was that kcn one.

When you substitute a cyanide ion, no of carbons increase, if you had put KCN you had end up with butanoic acid, but since the no off carbon atoms is same so it was NaOH(aq) followed by oxidation.

 

[PPanDDa]

What about the coiine question? Is it D?

 

[donorsolutions]

For all those people saying that ester hydrolysis question was 50, 50% thats wrong.
Propyl Ethanoate on Alkaline Hydrolysis produces : C3H7OH and CH3COONa
So Mass of C3H7OH = 60 g
Mass of CH3COONa = 82 g
Total Mass : 142 gram
Now expressing as percentages.
60/142= 42.3 %
82/142 = 57.7 %
Hope that Helps

 

[Soulgamer]

Answer to the equilibrium question was D (2P <---> Q+2R)
Answer to largest overall dipole was B
Answer to ester hydrolysis was C 42.3% and 57.7%
Answer to coiine question was IMO B (unclear)


btw what was the answer to the 3 possible products When HBr reacts with the two cis-trans structures?

 

[Sidma khan]

For all those people saying that ester hydrolysis question was 50, 50% thats wrong.
Propyl Ethanoate on Alkaline Hydrolysis produces : C3H7OH and CH3COONa
So Mass of C3H7OH = 60 g
Mass of CH3COONa = 82 g
Total Mass : 142 gram
Now expressing as percentages.
60/142= 42.3 %
82/142 = 57.7 %
Hope that Helps

it was given that only organic products were extracted!! for that we wont count Na mass!

 

[Soulgamer]

it was given that only organic products were extracted!! for that we wont count Na mass!

Acha? Then we should have only calculated the Alcohols percentage, Oh wait the question demanded both. Taking Na out, please elaborate what we get? Exactly nothing. We had to include Na in our calculation!

 

[Sidma khan]

Acha? Then we should have only calculated the Alcohols percentage, Oh wait the question demanded both. Taking Na out, please elaborate what we get? Exactly nothing. We had to include Na in our calculation!

maybe

 

[Soulgamer]

No seriously we when do alkaline hydrolysis we get two organic products.

 

[Sidma khan]

No seriously we when do alkaline hydrolysis we get two organic products.

Oh kuch nai hota agar aik galt ho gaya!

 

[Soulgamer]

Oh kuch nai hota agar aik galt ho gaya!

Apka ya mera?

 

[Sidma khan]

Apka ya mera?

Shayd mera he!