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OCR F324 (Chains, rings and spectroscopy) 28/06/10

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    Hello, thought I'd start the thread =D.
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    I really got to start learning all them god damn reactions....gonna start revision next week....Anybody already started?
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    I know o.O. Many many reactions.
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    Hey

    This is probably the exam I'm most worried about at the moment
    I attempted to start revising this morning but I only got as far as aldehydes and ketones before ending up on here lol.
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    It's the synthesis chapter that's the real killer

    We basically need to know the whole organic bit from AS as well in terms of reactions.
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    Has anyone got any useful revision posters/notes/cards for any of the topics in this module.. these normally get me started on revision :P
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    Not yet... well. I have cards, just not on the computer.. we could try to put overviews on here or something =D
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    Yeah that would be good Would help me alot.
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    I've made paper notes that I have already scanned in. I'll try and upload them tomorrow.
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    I'm glad someone has started this thread, anyone got any good reviosion resourses and sites???
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    I'm using a combination of the Heinemann book and the CGP revision guide...find them pretty helpful

    xxx
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    cgp is awesome.
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    (Original post by skatealexia)
    cgp is awesome.
    :five:

    Ok, I've now gone through the text book and revision guide for the first module (up to amines) so one down two to go

    xxx
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    half of second and half of third module to go
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    It's going good so far. It's just a matter of getting your head down and learning it.
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    Still haven't started going through the Analysis module

    Hate that unit
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    chemguide.com is pretty good! Google it because I'm not too sure if that is the exact web address.
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    I've started my revision. Just thought I'd share what I've learnt so far on Benzene:

    Problems with the Kekule structure of benzene:

    1) Low reactivity - C=C present so should react in similar way to alkenes
    - C=C should decolourise Bromine water.
    But this does not happen, does not undergo electrophilic addition, undergoes electrophilic substitution.

    2) Bond length - C-C and C=C have different bond lengths.

    But this is not the case, according to xray studies all C-C bonds are the same, equal length.

    3) Hydrogenation - expected enthalpy change of hydrogenation of benzene is -360kj mol-1, but the actual enthalpy change of hydrogenation of benzene is -208kj mol-1

    >>> Therefore the actual structure of benzene is more stable than kekule's.


    Delocalised model of benzene

    - Trigonal Planar 120 degrees
    - p-orbitals overlap around the whole of the ring forming a system of pie bonds.
    - electron spread all the whole of the ring >>> delocalised >>> more stable.
    - All C-C bonds are identical.

    Nucleophilic substitution

    Nitration of benzene:
    Uses: Dyes and pharmaceuticals.

    Conditions: Conc. H2SO4, conc. HNO3, 50 degrees C

    C6H6 + HNO3 >>> C6H5NO2 + H20



    Halogenation of benzene

    - Only reacts in the presence of a halogen carrier - AlCl3, FeCl3

    Benzene + Halogen >>> Halogenobenzene + Hydrogen Halide


    The mechanisms for the nitration and halogenation of benzene are attached.

    Enjoy.
    Attached Thumbnails
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Name:	Chlorination of Benzene mechanism.jpg 
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    Some flashcards summarising the spec you guys might find helpful

    http://www.flashcardexchange.com/flashcards/view/944334
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    http://www.allinfo.plus.com/levelup/index.htm
    http://www.knockhardy.org.uk/sci.htm

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Updated: November 15, 2012
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