AS Chemistry P2 Prep.

[MysteRyGiRl]

in case of aldehydes and ketones 2,4 DNPH reacts similar to the nucleophilic addition of HCN and gives a hydrogen to Oxygen in carbonyl group and than the whole rest of the molecule is joined to the carbon like addition of CN and than the OH and H on nitrogen which bonds with carbon of aldehyde or ketone form water so condensation occours and finally C forms double bond with N this organic compound is formed as ORANGE precipitate

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thnx but im not geting my answer in the f part of question nmbr 5 here http://www.xtremepapers.com/papers/...d AS Level/Chemistry (9701)/9701_w05_qp_2.pdf
plzz help

 

[mominzahid]

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

i guess a ketone will be formed

can this product be formed?
OHCCOOH????????

 

[Knight]

can this product be formed?
OHCCOOH????????

this is formed but it's oxidation occur and the end product is HOOCCOOH...

 

[Saad (سعد)]

can this product be formed?
OHCCOOH????????

Not if its heat under reflux. HOOCCOOH is what will be formed.

 

[TahaJamshed]

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just make the exact same compound shown except remove the H2 from the nitrogen on top and join it with the aldehyde formed watever it is ..... to join the aldehyde use the carbon to which the carbonyl group was attached to remove the carbonyl group and double bond that carbon with nitrogen of 2,4 DNPH

 

[MysteRyGiRl]

guys what will be formed when HOOCCH=CHCOOH is reacted with hot KMNO4?
please reply soon its urgent..

carboxylic acid will be formed

 

[MysteRyGiRl]

just make the exact same compound shown except remove the H2 from the nitrogen on top and join it with the aldehyde formed watever it is ..... to join the aldehyde use the carbon to which the carbonyl group was attached to remove the carbonyl group and double bond that carbon with nitrogen of 2,4 DNPH

oh thnx i 4got 2 luk @ cyclohexane -_- but thnx 4 reminding

 

[Farah1996]

how was the paper everyone?

 

[MysteRyGiRl]

http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_s11_qp_21.pdf
for q no 5 part c,the answer 4 Q is CH3CHO... shouldnt it b CH3CHO :s

 

[Saad (سعد)]

how was the paper everyone?

I don't think paper discussion is allowed before 24 hrs... is it?

 

[MysteRyGiRl]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_21.pdf
for q no 5 part c,the answer 4 Q is CH3CHO... shouldnt it b CH3CHO :s

nm i got it

 

[MysteRyGiRl]

I don't think paper discussion is allowed before 24 hrs... is it?

but u can ask how did it go?

 

[Farah1996]

I don't think paper discussion is allowed before 24 hrs... is it?

ya its not, am not discussing, just asking how did it go?

 

[Saad (سعد)]

ya its not, am not discussing, just asking how did it go?

Well, I found it very difficult... and I'm among the Top 5 smartest students in the school. >_<

 

[TahaJamshed]

ya its not, am not discussing, just asking how did it go?

AWESOME like it was very VERY EASY i am expecting literally like full or one mistake

 

[Farah1996]

Well, I found it very difficult... and I'm among the Top 5 smartest students in the school. >_<

xD but whyy?

 

[TahaJamshed]

my variant was paper 22

 

[Farah1996]

AWESOME like it was very VERY EASY i am expecting literally like full or one mistake

greaat

 

[Saad (سعد)]

xD but whyy?

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

 

[MysteRyGiRl]

my variant was paper 22

lucky u scnd variants i hope we r as lucky as u ppl