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OCR A Chemistry Paper 2 Unofficial Mark scheme Watch

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    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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    (Original post by TheAlphaParticle)
    but there was no C-O bond in the CNMR diagram, so how could it be phenol??
    I think there was. I am not entirely sure though!!
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    (Original post by TheAlphaParticle)
    but there was no C-O bond in the CNMR diagram, so how could it be phenol??
    There was, the first peak was RC-O
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    (Original post by Boss987)
    71% yield.
    Did anyone get 95 repeat units?
    Ester for hydrogen NMR. This includes 3 CH3.
    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 Chiral carbons??
    Acyl chloride + primary amine = amide MCQ
    Alicyclic and saturated??

    Help me finish the mark scheme!!!

    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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    (Original post by mobrien2404)
    In the beta carotene question it said it had 2 rings, was that referring to benzene rings?
    No the ring sure were alicyclic. It wanted to to work out that for every ring two carbons are lost so you have to consider that when working out the structure.
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    (Original post by Ashleigh123456)
    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)
    Did we need to state structure of M and N
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    (Original post by iamDev)
    Did we need to state structure of M and N
    i think so yes
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    Im so mad in the butan-1-ol question I got it all fine but I accidentally put the equation to form a carboxylic acid as forming 2H20 how many marks will I lose, just one?
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    (Original post by TheAlphaParticle)
    but there was no C-O bond in the CNMR diagram, so how could it be phenol??
    It was weakly acidic as ph 5. So it's carboxylic acid or phenol.not c acid because it didn't react with carbonate. Must be phenol
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    (Original post by Ashleigh123456)
    i think so yes
    it only asked for structure L so no
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    Got this for last question, not sure which one is correct though
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    (Original post by ellie.elephant)
    Im so mad in the butan-1-ol question I got it all fine but I accidentally put the equation to form a carboxylic acid as forming 2H20 how many marks will I lose, just one?
    One maximum!
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    (Original post by TheAlphaParticle)
    but there was no C-O bond in the CNMR diagram, so how could it be phenol??
    The carbon in the C-O might have counted as one of the benzene environment peaks. I didn't identify phenol either in the exam though, just hindsight thoughts.
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    Anyone else get C40H44 + 11H2 --> C40H66 for the beta carotene?
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    (Original post by Ashleigh123456)
    i think so yes
    U don't need to.
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    (Original post by Gaby123)
    The carbon in the C-O might have counted as one of the benzene environment peaks. I didn't identify phenol either in the exam though, just hindsight thoughts.
    I mean arene
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    Multiple choice answers
    1. B 2. D 3. C 4. B 5. D 6. C 7. A 8. C 9. C 10. D 11. C 12. A 13. A 14. C 15. A
    probs all wrong tbf
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    (Original post by puusssss)
    Multiple choice answers
    1. B 2. D 3. C 4. B 5. D 6. C 7. A 8. C 9. C 10. D 11. C 12. A 13. A 14. C 15. A
    probs all wrong tbf
    This means nothing to me, I don't remember any of the letters just the answers.
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    (Original post by Ashleigh123456)
    i think so yes
    it didn't say to state them
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    I got 3480cm^3 for the volume in one of the questions
 
 
 
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