AS Chemistry P2 Prep.

[TahaJamshed]

greaat

what abt you ?

 

[Farah1996]

The first question freaking... lost me lots of marks. >_< Everything else was easy, but tricky.

Varient 2?

 

[kwazieeekezzy]

first a C=O bond is formed and then it's oxidation occurs and a carboxylic acid is formed

buh i thought it was only when an aldehyde is formed that further oxidation results in carboxylic acids

 

[Farah1996]

what abt you ?

Mine was gudd too, but not to an extent of getting full marks xD

 

[Saad (سعد)]

Varient 2?

22.

 

[Farah1996]

22.

oh here too

 

[Saad (سعد)]

Mine was gudd too, but not to an extent of getting full marks xD

Mine was good to the extent of getting almost full marks in every question... except the first. I think I'll lose at least 3-6 marks there... >_<

 

[Farah1996]

Mine was good to the extent of getting almost full marks in every question... except the first. I think I'll lose at least 3-6 marks there... >_<

thats really gud, i mean ur only losing 3-6 marks, thats like a definite A , and a high one too

 

[Saad (سعد)]

buh i thought it was only when an aldehyde is formed that further oxidation results in carboxylic acids

It does not remain an aldehyde... if you used reflux condition, its oxidized to carboxylic acid. If you distilled off the aldehyde as soon as it is formed without letting it oxidize, then it will remain aldehyde... otherwise the product of the oxidation of a primary alcohol is a carboxylic acid.

 

[Knight]

It does not remain an aldehyde... if you used reflux condition, its oxidized to carboxylic acid. If you distilled off the aldehyde as soon as it is formed without letting it oxidize, then it will remain aldehyde... otherwise the product is a carboxylic acid.

whatever........the answer was HOOCCOOH and the type of reaction was oxidation

 

[kwazieeekezzy]

It does not remain an aldehyde... if you used reflux condition, its oxidized to carboxylic acid. If you distilled off the aldehyde as soon as it is formed without letting it oxidize, then it will remain aldehyde... otherwise the product is a carboxylic acid.

i know that, buh i dont think ketones can be oxidized further to form carboxylic acids

 

[MysteRyGiRl]

i know that, buh i dont think ketones can be oxidized further to form carboxylic acids

its not a ketone

 

[Saad (سعد)]

Question; does it make a difference whether we write a carboxylic acid (say ethanoic acid) as CH3COOH, or CH3CO2H? Because I'm used to writing '-COOH', but the Examiner/Paper Setter always writes '-CO2H'... o_o...

 

[MysteRyGiRl]

Question; does it make a difference whether we write a carboxylic acid (say ethanoic acid) as CH3COOH, or CH3CO2H? Because I'm used to writing '-COOH', but the Examiner/Paper Setter always writes '-CO2H'... o_o...

its da same thing

 

[Knight]

Question; does it make a difference whether we write a carboxylic acid (say ethanoic acid) as CH3COOH, or CH3CO2H? Because I'm used to writing '-COOH', but the Examiner/Paper Setter always writes '-CO2H'... o_o...

i wrote CO2H but i think COOH is also acceptable........

 

[Saad (سعد)]

its da same thing

I know that... but we have to be considerate of what the Examiner likes more... if we want an A* instead of an A. o_o;

 

[kwazieeekezzy]

its not a ketone
so an aldehyde is formed and is further oxidized into a carboxylic acid...

 

[MysteRyGiRl]

http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_s11_qp_22.pdf
umm frst question b ii) ? how did we get da answer

 

[MysteRyGiRl]

I know that... but we have to be considerate of what the Examiner likes more... if we want an A* instead of an A. o_o;

dat what i mean,they wont cut ur marks if u write either of them.but if u have a doubt go ahead wd CO2H

 

[TheMan123]

I know that... but we have to be considerate of what the Examiner likes more... if we want an A* instead of an A. o_o;

The examiner isn't there to punish you, they are there to test your knowledge, they will accept both because they are both correct