Yeahwhat
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#1
Report Thread starter 4 years ago
#1
71% yield.
Did anyone get 95 repeat units?
Ester for hydrogen NMR. This includes 3 CH3.
At the end L was a Ester: CH3CH2COOCH2C(CH3)2CH3
M was a carboxylic acid: CH3CH2COOH
N was an alcohol : HOCH2C(CH3)2CH3 (Ashleigh)
recrystallisation for the method.
Phenol with ethanone joined together. for C NMR.
https://www.thestudentroom.co.uk/att...2&d=1497870262
Butan-1-ol + 2O] --> Butanoic acid and Water, using acidified potassium dichromate and under reflux
Butan-1-ol + [O] --> Butanal and water, using acidified potassium dichromate and distillation technique (AnnaRainbows)
Diol more soluble as it has two hydroxyl groups.
Alcohol forms h bonds with water so soluble.
https://www.google.co.uk/url?sa=i&rc...97957876618458
Beta carotene Q
C40H56 + 11H2 --> C40H78 (TuffyandTab)

MCQ
BDCBDCACCBCAACB (tamoni4)
AgNo3
C7H14 - molecular formula
Addition reaction (economy)
Trigonal planar - Atom no. 3
3 peaks for NMR in MCQ
3 or 4 Chiral carbons??
Acyl chloride + primary amine = amide MCQ
Alicyclic and saturated??

Good Paper!!!
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blazingriver
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#2
Report 4 years ago
#2
(Original post by Boss987)
71% yield.
Did anyone get 95 repeat units?
Ester for hydrogen NMR. This includes 3 CH3.
recrystallisation for the method.
Ketone with benzene for C NMR.

MCQ
3 peaks for NMR in MCQ
3 Chiral carbons??
Acyl chloride + primary amine = amide MCQ

Help me finish the mark scheme!!!
1st question AgNO3, another multiple choice is C6H14 maybe it was c7
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medhelp
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#3
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#3
(Original post by Boss987)
71% yield.
Did anyone get 95 repeat units?
Ester for hydrogen NMR. This includes 3 CH3.
recrystallisation for the method.
Ketone and phenol group with benzene for C NMR.
https://www.thestudentroom.co.uk/att...2&d=1497870262

MCQ
3 peaks for NMR in MCQ
3 Chiral carbons??
Acyl chloride + primary amine = amide MCQ

Help me finish the mark scheme!!!
i got 4 chiral centres but im **** so im probably wrong

other questions i vaguely remember

butan-1-ol
the oxidation well it was distil to aldehye and reflux to COOH wasn't it? both with K2Cr2O7/H+



that recrystallisation was purity of benzoic acid after substituted with no2 + % yield



MCQS:
some bond angle ****
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URGENT Issue
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#4
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#4
(Original post by Boss987)
71% yield.
Did anyone get 95 repeat units?
Ester for hydrogen NMR. This includes 3 CH3.
recrystallisation for the method.
Ketone and phenol group with benzene for C NMR.
https://www.thestudentroom.co.uk/att...2&d=1497870262

MCQ
3 peaks for NMR in MCQ
3 Chiral carbons??
Acyl chloride + primary amine = amide MCQ

Help me finish the mark scheme!!!
I got a ketone and phenol?
And 4 chiral centres
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tamoni4
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#5
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#5
My MCQ answers were: BDCBDCACCBCAACB
Formula of unsaturated beta carotine was C40H56
Nylon 6,6 had 95 repeat units
For the first NMR question I had a phenylketone (C8H8O2)
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AnnaRainbows
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#6
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#6
Pray for error carried forward D: I definitely didn't get the right compound for the last NMR question my dumbass put amino acid rip
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RainBear
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#7
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#7
How many marks will I lose for putting h+ in the oxidation equation instead of H2O? (I put H2O and then crossed it out)
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Theragingninja
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#8
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#8
Hmmm for repeat units i got 140
C40H22
Phenol Ketone
Bond angle atom C
Branching - less points of surface contact hence weaker London forces
Yield = 73.56% (something along those lines)
Combined techniques last question was an ester

4 Chiral carbons
3 peaks for MCQ
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Tuffyandtab
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#9
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#9
Last question I got an ester - CH3CH2COOCH2C(CH3)3
Question before with carbon-13 NMR - phenol with ethanone joined together.

I'm pretty certain on these.
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Tuffyandtab
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#10
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#10
Beta carotene Q
C40H56 + 11H2 --> C40H78
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avz1512
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#11
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#11
(Original post by Boss987)
71% yield.
Did anyone get 95 repeat units?
Ester for hydrogen NMR. This includes 3 CH3.
recrystallisation for the method.
Ketone and phenol group with benzene for C NMR.
https://www.thestudentroom.co.uk/att...2&d=1497870262
Butan-1-ol + 2O] --> Butanoic acid and Water, using acidified potassium dichromate and under reflux
Butan-1-ol + [O] --> Butanal and water, using acidified potassium dichromate and distillation technique (AnnaRainbows)
Diol more soluble as it has two hydroxyl groups.
Alcohol forms h bonds with water so soluble.
https://www.google.co.uk/url?sa=i&rc...97957876618458

MCQ
BDCBDCACCBCAACB (tamoni4)
AgNo3
C7H14 - molecular formula
Addition reaction (economy)
Trigonal planar - Atom no. 3
3 peaks for NMR in MCQ
3 Chiral carbons??
Acyl chloride + primary amine = amide MCQ

Help me finish the mark scheme!!!
yep got 95 repeat units mr was something like 226 if you remember . what did yoou get for the beta carotene question, that was one i was unsure of
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Theragingninja
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#12
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#12
(Original post by Tuffyandtab)
Last question I got an ester - CH3CH2COOCH2C(CH3)3
Question before with carbon-13 NMR - phenol with ethanone joined together.

I'm pretty certain on these.
I agree!
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avz1512
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#13
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#13
(Original post by blazingriver)
1st question AgNO3, another multiple choice is C6H14 maybe it was c7
it was c7h14 which was choice C i think
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tamoni4
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#14
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#14
For the last NMR question, I've got a
2,2-dimethylpropyl ethanoate
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tamoni4
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#15
Report 4 years ago
#15
(Original post by mobrien2404)
In the beta carotene question it said it had 2 rings, was that referring to benzene rings?
No, they would have said aromatic rings if it was benzene.
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AnnaRainbows
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#16
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#16
Why is it AgNO3 to measure the rate of activity/reaction? I put KCl because to see which one reacts fastest you need a displacement reaction? Cl displaces both iodine and bromine and then you can look at the speed... oh gosh
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TheAlphaParticle
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#17
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#17
(Original post by Tuffyandtab)
Last question I got an ester - CH3CH2COOCH2C(CH3)3
Question before with carbon-13 NMR - phenol with ethanone joined together.

I'm pretty certain on these.
but there was no C-O bond in the CNMR diagram, so how could it be phenol??
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AnnaRainbows
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#18
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#18
(Original post by mobrien2404)
In the beta carotene question it said it had 2 rings, was that referring to benzene rings?
Nope it could have also meant alicyclic rings not aromatic
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Yeahwhat
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#19
Report Thread starter 4 years ago
#19
(Original post by AnnaRainbows)
Why is it AgNO3 to measure the rate of activity/reaction? I put KCl because to see which one reacts fastest you need a displacement reaction? Cl displaces both iodine and bromine and then you can look at the speed... oh gosh
To see which one forms the precipitate first. Ag+(aq) + X-(aq) -------> AgX(s)
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Ashleigh123456
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#20
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#20
At the end L was a Ester: CH3CH2COOCH2C(CH3)2CH3
M was a carboxylic acid: CH3CH2COOH
N was an alcohol : HOCH2C(CH3)2CH3

(although i'm pretty sure you could've had the groups the other way around too)
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