HOW WAS CHEMISTRY PAPER 22 ?

[Ansar Khan]

It was quite difficult, the 1st and the 4th question were tough other than that all went well Hope the Gt is low anybody knows the equation when Nh4Cl + H2SO4 react what will be the products i wrote CaCl2 + H2O + NH3 are these correct ?

It wasn't H2SO4, it was a calcium compound, as you're getting a Ca in your products.

 

[speedy20]

Idolfanatic95
Sorry for my last post not H2SO4 i wrote NH4Cl + CaO ---> H2O + NH3 + CaCl2 i balanced it em too lazy to do it now I dont think it was Ca(OH)2 as CaO was the best drying agent.

 

[speedy20]

Any body knows the answer of the X moles in question 1 ? i got 6

 

[Idolfanatic95]

i

Any body knows the answer of the X moles in question 1 ? i got 6

It was 7

 

[Ansar Khan]

The compound was tertiary alcohol it was (CH3)3CHO try drawing the structure u will get to know.

Yes, u see that it was CHO. It means that H is before O. That's impossible for an alcohol as a hydrogen can only form one bond (i.e. either with carbon or with oxygen).It can't form a bond with both of them at the same time. What I remember is that it was (CH3)3CCHO.

 

[Ansar Khan]

Any body knows the answer of the X moles in question 1 ? i got 6

6.92 something, which rounded off to 7.

 

[Idolfanatic95]

Idolfanatic95
Sorry for my last post not H2SO4 i wrote NH4Cl + CaO ---> H2O + NH3 + CaCl2 i balanced it em too lazy to do it now I dont think it was Ca(OH)2 as CaO was the best drying agent.

CaO was a drying agent, it didn't have to take part in the reaction to form ammonia. it was there to absorb the water produced in the reaction between ammonium chloride and calcium hydroxide

 

[speedy20]

no there were only 4 carbons it was (CH3)3CHO if it were (CH3)3CCHO there would be an aldehyde.

 

[speedy20]

Oh fish :/ i got 6 :/ anyways

 

[hino]

See I have never seen a compound anywhere which has a CHO in the end and is an alcohol. A CHO in the end always means that the carbon has a double bond with oxygen, indicating that it's an aldehyde. It it were alcohol, it would've been OH then. Btw do you remember the exact formula of the compound?

yes its exactly (CH3)2CHO as mentioned by speed20
and since it was a structural formula,it iznt necessary that if it was written this way u wud call it an aldehyde

 

[Idolfanatic95]

Oh fish :/ i got 6 :/ anyways

nvm just a mark

 

[speedy20]

Idolfanatic95
I just found the reaction in my text book it was CaO

 

[hino]

(CH3)3CHO*

 

[Idolfanatic95]

Idolfanatic95
I just found the reaction in my text book it was CaO

Which text book u referring to?
In the chapter nitrogen and sulphur, see the given reaction under the topic ammonia and ammonium compounds

 

[Nishii]

See I have never seen a compound anywhere which has a CHO in the end and is an alcohol. A CHO in the end always means that the carbon has a double bond with oxygen, indicating that it's an aldehyde. It it were alcohol, it would've been OH then. Btw do you remember the exact formula of the compound?

it was (CH3)3COH!

 

[Ansar Khan]

yes its exactly (CH3)2CHO as mentioned by speed20
and since it was a structural formula,it iznt necessary that if it was written this way u wud call it an aldehyde

It it was (CH3)2CHO, then the last carbon has only three bonds attached if u consider it to be an alcohol . Secondly, structural formula always matters. If u show me any compound from anywhere which is an alcohol and has a CHO in the end, I'll accept that I'm wrong then.

 

[speedy20]

What was the Answer of question 5 ? the 2 isomers ? I had a cis-trans and an optical isomer pair are these correct?

 

[Nishii]

How was Paper 4?!

 

[speedy20]

Dudes it was (CH3)3CHO i remember -_- i spent 10 mins on guessing its structure

 

[Ansar Khan]

it was (CH3)3COH!

I stared at that compound for 5 minutes. It was CHO, everybody's accepting that there was an HO in the end. That's got to be an aldehyde.