HOW WAS CHEMISTRY PAPER 22 ?

[Nishii]

And now can please tell me that what were the two pair isomers ? I had a cis-trans pair and an optical isomers pair am i right?

yeah!

 

[Idolfanatic95]

And now can please tell me that what were the two pair isomers ? I had a cis-trans pair and an optical isomers pair am i right?

Yep right. They are the only stereioisomers we cud get

 

[Ansar Khan]

View attachment 18081

Look, I got your point. But what puzzled me was that it was written HO, as u still remember. If it was alcohol, they could've simply written OH.

 

[Nishii]

Were they seven or 6? And please, CIE examiners that not that lenient that they'll give u straight marks for just writing a letter and a color change.

Well.. we'll see that when the mark scheme is published. there were 6 compounds, 3 no reaction, and among the 3 others there were an ester, which was hydrolysed by NaOH into and alcohol and a salt

 

[speedy20]

Ansar
Maybe CIE wanted to trick us So we think that it is an aldehdye

 

[Idolfanatic95]

Honestly i didn't find organic difficult this time. The format was different than the the previous years but it was cool plus the paper was easily finished on time.
Im glad im saying this cuz i considered myself weak in organic

 

[Nishii]

you guys didnt take chemistry P42?

 

[Idolfanatic95]

you guys didnt take chemistry P42?

Nope

 

[Ansar Khan]

Every mark matters. But I guess I lost my senses somewhere. Anyways, sorry people. Hope we all get As InshaAllah. Peace.

 

[speedy20]

Nishii
I was appearing for a retake for my AS chemistry didnt take paper 42

 

[speedy20]

Ansar Khan
Summa Ameen

 

[Nishii]

Every mark matters. But I guess I lost my senses somewhere. Anyways, sorry people. Hope we all get As InshaAllah. Peace.

hope you catch the marks lost in P1

 

[rizwaan]

you guys didnt take chemistry P42?

hey nishi i have taken p4 and the organic ques was disastrous

 

[Nishii]

hey nishi i have taken p4 and the organic ques was disastrous

for me too! horrible! Worst, the two questions make up 28 marks! otherwise the level was kinda low..gt will be high for sure!

 

[MrAnon]

0.5 or 0.05?g :O

0.5g of RAW medicine!
Like 0.5g of tablet.
How can a tablet be of 0.05g?

 

[arsalan116]

Haha yes hoga

haha thanx...

 

[messi10]

mole and organic colour changes nailed me.. lol

 

[rohit63]

Source : http://www.chemguide.co.uk/organicprops/carbonyls/oxidation.html

4th paragraph from top:

Because ketones don't have that particular hydrogen atom, they are resistant to oxidation. Only very strong oxidising agents like potassium manganate(VII) solution (potassium permanganate solution) oxidise ketones - and they do it in a destructive way, breaking carbon-carbon bonds.

I guess if chemguide says so, it must be reliable.
So the answer to the last part of the table is that it oxidizes the ketone, and the colour change is from purple to colourless

 

[Idolfanatic95]

Source : http://www.chemguide.co.uk/organicprops/carbonyls/oxidation.html

4th paragraph from top:

Because ketones don't have that particular hydrogen atom, they are resistant to oxidation. Only very strong oxidising agents like potassium manganate(VII) solution (potassium permanganate solution) oxidise ketones - and they do it in a destructive way, breaking carbon-carbon bonds.

I guess if chemguide says so, it must be reliable.
So the answer to the last part of the table is that it oxidizes the ketone, and the colour change is from purple to colourless

Howcome they never mentioned in our course book

 

[Taci12]

Howcome they never mentioned in our course book

I don't think we'll lose marks. All we're supposed to know is that ketones are not oxidised. I doubt we'll be penalised, unless Cambridge plays the devil