Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    Which organic mechanisms do we need to know (for Edexcel AS Chemistry, Units 1 and 2)?

    I know the electrophilic addition mechanism is needed, as are both (SN1 and SN2) nucleophilic substitution mechanisms. Do we need the elimination mechanism(s)? Esterification? Oxidation of alcohol to aldehyde/ketone/carboxylic acid?

    For each reaction, we need rates (is it fastest with a primary, secondary, tertiary, longer alkyl chain, shorter alkyl chain, etc.) and conditions. Anything else?

    And do we need physical trends in the organic groups (e.g. alcohols have higher boiling points than aldehydes, etc; primary alcohols have higher boiling points than tertiary alcohols, etc.)?
    Offline

    11
    ReputationRep:
    (Original post by Big-Daddy)
    Which organic mechanisms do we need to know?

    I know the electrophilic addition mechanism is needed, as are both (SN1 and SN2) nucleophilic substitution mechanisms. Do we need the elimination mechanism(s)? Esterification? Oxidation of alcohol to aldehyde/ketone/carboxylic acid?

    For each reaction, we need rates (is it fastest with a primary, secondary, tertiary, longer alkyl chain, shorter alkyl chain, etc.) and conditions. Anything else?

    And do we need physical trends in the organic groups (e.g. alcohols have higher boiling points than aldehydes, etc; primary alcohols have higher boiling points than tertiary alcohols, etc.)?
    Which board?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by joostan)
    Which board?
    Oh sorry, I should have specified - Edexcel.
    Offline

    11
    ReputationRep:
    (Original post by Big-Daddy)
    Oh sorry, I should have specified - Edexcel.
    Ahh I do AQA and need to know all of the above
    As for you its very long and i don't want to read it all so here you go:
    Learn all on this http://www.edexcel.com/migrationdocu...4%20250510.pdf
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by joostan)
    Ahh I do AQA and need to know all of the above
    As for you its very long and i don't want to read it all so here you go:
    Learn all on this http://www.edexcel.com/migrationdocu...4%20250510.pdf
    What are all the mechanisms you need for AQA?

    The Edexcel has some weird stuff I doubt you'll find anywhere else ... ever heard of the "O2 and O3 free radical substitution mechanism" or "discuss and explain, including mechanisms and the reactions involved, reasons CFCs are no longer used due to their damaging effect on the O3 layer"?
    Offline

    11
    ReputationRep:
    (Original post by Big-Daddy)
    What are all the mechanisms you need for AQA?

    The Edexcel has some weird stuff I doubt you'll find anywhere else ... ever heard of the "O2 and O3 free radical substitution mechanism" or "discuss and explain, including mechanisms and the reactions involved, reasons CFCs are no longer used due to their damaging effect on the O3 layer"?
    Yeah we got that.
    Mechanisms:
    Free radical substitution.
    Elimination.
    Nucleophillic substitution.
    Electrophillic addition
    Dehydration of alcohols using H2SO4
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by joostan)
    Yeah we got that.
    Mechanisms:
    Free radical substitution.
    Elimination.
    Nucleophillic substitution.
    Electrophillic addition
    Dehydration of alcohols using H2SO4
    Dehydration of alcohols is just leaving-group elimination isn't it?

    What is my syllabus really asking for when it says "O2 and O3 free radical substitution mechanism" or "discuss and explain, including mechanisms and the reactions involved, reasons CFCs are no longer used due to their damaging effect on the O3 layer"? Anywhere I can find these online (because they aren't in my textbook)?
    Offline

    11
    ReputationRep:
    (Original post by Big-Daddy)
    Dehydration of alcohols is just leaving-group elimination isn't it?

    What is my syllabus really asking for when it says "O2 and O3 free radical substitution mechanism" or "discuss and explain, including mechanisms and the reactions involved, reasons CFCs are no longer used due to their damaging effect on the O3 layer"? Anywhere I can find these online (because they aren't in my textbook)?
    Yes but its a slightly different mechanism.
    As for the rest provided you know the mechanisms the rest is common sense.
    O3 absorbs UV radiation, without it the radiation can get through to the earth.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by joostan)
    Yes but its a slightly different mechanism.
    As for the rest provided you know the mechanisms the rest is common sense.
    O3 absorbs UV radiation, without it the radiation can get through to the earth.
    So what bond is being broken in the case of O3/O2 free radical substitution, and what are the radicals then substituting onto?
    Offline

    11
    ReputationRep:
    (Original post by Big-Daddy)
    So what bond is being broken in the case of O3/O2 free radical substitution, and what are the radicals then substituting onto?
    Cl.for example attacks O3 creating O2 and OCl.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by joostan)
    Cl.for example attacks O3 creating O2 and OCl.
    OK, and the destruction of O3 is "depletion of the ozone layer" with all these bad environmental effects that we keep hearing about, etc.

    What is the relevance of CFCs? Just that they contain F and Cl which can then be made into radicals to make this process happen?
    Offline

    11
    ReputationRep:
    (Original post by Big-Daddy)
    OK, and the destruction of O3 is "depletion of the ozone layer" with all these bad environmental effects that we keep hearing about, etc.

    What is the relevance of CFCs? Just that they contain F and Cl which can then be made into radicals to make this process happen?
    Exactly
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Has a teacher ever helped you cheat?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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.