Turn on thread page Beta
    • Thread Starter
    Offline

    7
    ReputationRep:
    Can't really remember many of the questions now, so please contribute!

    Fox Corner


    MCQ Section [15 marks, 1 mark each]
    1. Silver Nitrate
    ?. Z isomer was the one with Cl and F on the same side.
    ?. 5 chiral carbons


    Section B [85 marks]

    Name the alcohol/alkene [1 mark]
    Hex-3-en-1-ol (ACCEPT 1-hydroxy hex-3-ene)

    Define Stereoisomers [1 mark]
    Molecules with same structural formula, different spatial arrangement.

    Purifying the benzene based solid and assessing purity [6 mark]
    -Filter under r.pressure
    -Recrystallise (hot solvent and cool)
    -Filter under r.pressure (cool solvent)
    -Dry
    -Melting point compare with known mp (data book/database)
    % yield - ???

    Unknown Aromatic Compound - molecular formula [2 marks]
    -m+ at m/7=136??
    -C4H4O E.F.
    -C8H8O2 M.F.

    Reagents Flowchart [3? marks]
    Dilute HCl(aq)


    Reagents and isomers [5 marks]
    3-methylcyclohexanone
    NaBH4
    3-methylbromohexanone
    3-methylcyclohexene
    4-methylcyclohexene

    Unknown Aromatic Compound - observations [3 marks]
    - Weakly acidic pH but no reaction with the weak sodium carbonate base => phenol.
    - 2,4-DNPH ppt but absence of silver mirror with Tollens' => carbonyl, not an aldehyde so ketone.

    Unknown Aromatic Compound - carbon NMR to suggest structure [3 marks]
    - 6 carbon environments
    - 4-hydroxyphenylethanone

    Combined Techniques (last question) [6 marks]
    2,2-dimethylpropyl propanoate
    Offline

    21
    ReputationRep:
    Nice markscheme! I've added it into the unofficial markscheme list
    Offline

    14
    ReputationRep:
    https://www.thestudentroom.co.uk/sho....php?t=4791330
    Offline

    1
    ReputationRep:
    Not sure what question was that but this question was about diagram either 4 or 5 marks

    Reducting agent: NaBH4
    Isomers: 2-methylcyclohexene and 3-methylcyclohexene
    Offline

    1
    ReputationRep:
    4 Chriral carbons

    C40h56+11h2->c40h78
    Offline

    1
    ReputationRep:
    Z isomer B

    For reagents
    Dilute HCl and water
    NaBH4 and water
    Offline

    1
    ReputationRep:
    The other question asked about diagram about CN

    HCOH to H2C(OH)CN then it needs LiAlH4 to from H2C(OH)CH2NH2
    Offline

    14
    ReputationRep:
    Beta carotene Q
    C40H56 + 11H2 --> C40H78


    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.
    Offline

    14
    ReputationRep:
    (Original post by DoubleDoors)
    Combined Techniques (last question) [6 marks]
    2,2-dimethylpropyl ethanoate
    I believe it was 2,2-dimethylpropyl propanoate
    • Thread Starter
    Offline

    7
    ReputationRep:
    (Original post by Tuffyandtab)
    I believe it was 2,2-dimethylpropyl propanoate
    Ah yeah because of the CH3CH2. Thank god I still remember putting that!!
    Offline

    1
    ReputationRep:
    The one about benzene vs benzeanoic acid and phenol. Benzeanoic electron withdrawing. Phenol electron donating. Benzene is between the two etc
    Offline

    2
    ReputationRep:
    Predictions for A/A* grade boundaries?
    Offline

    0
    ReputationRep:
    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
    Offline

    1
    ReputationRep:
    any predictions for grade boundaries?
    Offline

    1
    ReputationRep:
    (Original post by Tuffyandtab)
    Beta carotene Q
    C40H56 + 11H2 --> C40H78


    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.

    CH3CH2COOCH2C(CH3)3-
    yep i got this too!
    Offline

    0
    ReputationRep:
    hex-3-enol >>>>>> is the 1-ol required or can that be implied
    Offline

    0
    ReputationRep:
    grade boundaries last year for new spec AS was 80% (56/70) for an A in paper 1 so grade boundary probz 80 for A, 89 for A* this year
    Offline

    6
    ReputationRep:
    (Original post by Julz619)
    grade boundaries last year for new spec AS was 80% (56/70) for an A in paper 1 so grade boundary probz 80 for A, 89 for A* this year
    Overall it was lower than that. 56 was on the depth paper which was straight forward
    Offline

    9
    ReputationRep:
    (Original post by DoubleDoors)
    Can't really remember many of the questions now, so please contribute!

    Fox Corner


    MCQ Section [15 marks, 1 mark each]
    1. Silver Nitrate
    ?. Z isomer was the one with Cl and F on the same side.
    ?. 5 chiral carbons


    Section B [85 marks]

    Name the alcohol/alkene [1 mark]
    Hex-3-en-1-ol (ACCEPT 1-hydroxy hex-3-ene)

    Define Stereoisomers [1 mark]
    Molecules with same structural formula, different spatial arrangement.

    Purifying the benzene based solid and assessing purity [6 mark]
    -Filter under r.pressure
    -Recrystallise (hot solvent and cool)
    -Filter under r.pressure (cool solvent)
    -Dry
    -Melting point compare with known mp (data book/database)
    % yield - ???

    Unknown Aromatic Compound - molecular formula [2 marks]
    -m+ at m/7=136??
    -C4H4O E.F.
    -C8H8O2 M.F.

    Reagents Flowchart [3? marks]
    Dilute HCl(aq)


    Reagents and isomers [5 marks]
    3-methylcyclohexanone
    NaBH4
    3-methylbromohexanone
    3-methylcyclohexene
    4-methylcyclohexene

    Unknown Aromatic Compound - observations [3 marks]
    - Weakly acidic pH but no reaction with the weak sodium carbonate base => phenol.
    - 2,4-DNPH ppt but absence of silver mirror with Tollens' => carbonyl, not an aldehyde so ketone.

    Unknown Aromatic Compound - carbon NMR to suggest structure [3 marks]
    - 6 carbon environments
    - 4-hydroxyphenylethanone

    Combined Techniques (last question) [6 marks]
    2,2-dimethylpropyl propanoate
    Few more questions and my answers(if we disagreed on anything i'll bold it)
    MCQ:
    4 Chiral centres
    atom 3 was trigonal planar
    6.02x10^22 atoms
    C2H4O
    3 NMR peaks
    C4H14
    alicyclic and saturated

    section B
    Reagents Flowchart: H2O/Hcl, HCHO drawn in left box, H2/Ni down

    1,6 hexandiamine and butandioc acid
    two repeat units, biodegradable as ester bond hydrolysed

    108cm^3
    C40H56 + 11H2 -> C40H78

    95 repeat units

    71% yield, method for purifying organic solid

    Butanol oxidised: to aldehyde and to Carb acid. butanol + [O] > Butanal + H2O, distill, cr2o7-/h+
    butanol + 2[O] > Butanoic Acid + H2O, reflux, cr2o7-/h+
    Offline

    9
    ReputationRep:
    (Original post by Julz619)
    grade boundaries last year for new spec AS was 80% (56/70) for an A in paper 1 so grade boundary probz 80 for A, 89 for A* this year
    More content to not remember/apply correctly, more marks (so % of marks dropped will likely rise), I reckon for the two papers so far:

    paper 1 (A*,A,B,C,D,E,U)
    88,80,72,66,58,50,0

    paper 2 (A*,A,B,C,D,E,U)
    85,79,73,68,61,54,0

    For paper 3, I reckon it'll drop to about:
    (outta 70)
    55,48,42,36,30,25,0

    overall: 228,207,197, 170, 149, 129
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: June 22, 2017
Poll
Do you think parents should charge rent?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.