Join TSR now and get all your revision questions answeredSign up now
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by MathsNerd1)
    I was thinking because its got 12 hydrogens in the same environment making it the most stable, therefore putting it as the standard. But what you said was correct too.


    Posted from TSR Mobile
    yes, good point!


    Describe why phenol reacts more readily with chlorine as compared to benzene (3 marks and 1 mark for QWC)
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by otrivine)
    yes, good point!


    Describe why phenol reacts more readily with chlorine as compared to benzene (3 marks and 1 mark for QWC)
    Okay well in the phenol the non bonded pair of electrons in the oxygen from the phenol I'd fed into the delocalised ring of electrons, which increases the electron density of the compound making it have a greater attraction towards bromine therefore it doesn't need a halogen carrier like it does with benzene.


    Posted from TSR Mobile
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by MathsNerd1)
    Okay well in the phenol the non bonded pair of electrons in the oxygen from the phenol I'd fed into the delocalised ring of electrons, which increases the electron density of the compound making it have a greater attraction towards bromine therefore it doesn't need a halogen carrier like it does with benzene.


    Posted from TSR Mobile

    4/4 good

    my turn
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by otrivine)
    4/4 good

    my turn
    Thanks, explain why the structure of benzene has had to be adapted through time. (4)


    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    (Original post by otrivine)
    yes column chromatogrppahy is to do with Gas chromatography

    please tell me what is HPC thingy:confused: worried now
    Are you going for an A* Otrivine?

    Some of your answers are so detailed. :/ :/ Not sure the book definitions are even as detailed.

    Scared and confused. I need to up my game.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by MathsNerd1)
    Thanks, explain why the structure of benzene has had to be adapted through time. (4)


    Posted from TSR Mobile
    Because there was a kekule structure that was proposed as the benzene strucutre. As the year progressed , using x-ray crystallography they found that in benzene the c-c bond lengths are the same. The enthalpy change of hydrogenation of benzene is slightly less exothermic than Kekule and the extra energy is used to break the pi bond known as resosance energy. Therefore, benzene is more stable than kekule. Also, in Benzene it has lower electron density and therefore cannot polarise halogen molecules such as bromine.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Better)
    Are you going for an A* Otrivine?

    Some of your answers are so detailed. :/ :/ Not sure the book definitions are even as detailed.

    Scared and confused. I need to up my game.

    Dont worry

    Have you started doing papers?
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by Better)
    Are you going for an A* Otrivine?

    Some of your answers are so detailed. :/ :/ Not sure the book definitions are even as detailed.

    Scared and confused. I need to up my game.
    This is our competition and I can tell you I'm no where near this good! I'm quite desperate to get this A!


    Posted from TSR Mobile
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by otrivine)
    Because there was a kekule structure that was proposed as the benzene strucutre. As the year progressed , using x-ray crystallography they found that in benzene the c-c bond lengths are the same. The enthalpy change of hydrogenation of benzene is slightly less exothermic than Kekule and the extra energy is used to break the pi bond known as resosance energy. Therefore, benzene is more stable than kekule. Also, in Benzene it has lower electron density and therefore cannot polarise halogen molecules such as bromine.
    Correct!


    Posted from TSR Mobile
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by MathsNerd1)
    Correct!


    Posted from TSR Mobile
    Describe electrophilic substiution (4)
    Offline

    1
    ReputationRep:
    (Original post by MathsNerd1)
    This is our competition and I can tell you I'm no where near this good! I'm quite desperate to get this A!


    Posted from TSR Mobile
    Yeah your right man. You've made me nervous. But in a good way. I really want an A*. 55+/60 Chem 4 and 90+/100 Chem 5.

    Come at us Otrivine. I am going to start Recapping Chemistry EVERYDAY!
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by Better)
    Yeah your right man. You've made me nervous. But in a good way. I really want an A*. 55+/60 Chem 4 and 90+/100 Chem 5.

    Come at us Otrivine. I am going to start Recapping Chemistry EVERYDAY!
    I tend to do 3 hours a day now because of all this! But I've got 3 units to tackle and sometimes the length of time will vary really, yeah we'll do better than him now!


    Posted from TSR Mobile
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by otrivine)
    Describe electrophilic substiution (4)
    Is that the one used in nitration of benzene? And halogenation too?


    Posted from TSR Mobile
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by MathsNerd1)
    This is our competition and I can tell you I'm no where near this good! I'm quite desperate to get this A!


    Posted from TSR Mobile
    You are very good
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by MathsNerd1)
    Is that the one used in nitration of benzene? And halogenation too?


    Posted from TSR Mobile
    yes but describe the mechanism in words
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by otrivine)
    You are very good
    I'm seriously not, quite poor really.


    Posted from TSR Mobile
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by otrivine)
    yes but describe the mechanism in words
    Oh, I can't do that, I'd just draw the mechanism as surely that's also correct too?


    Posted from TSR Mobile
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by MathsNerd1)
    I'm seriously not, quite poor really.


    Posted from TSR Mobile
    No you are good!! `

    I am so happy we have F325 first, I enjoy unit 5 more than unit 4
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by MathsNerd1)
    Oh, I can't do that, I'd just draw the mechanism as surely that's also correct too?


    Posted from TSR Mobile
    Yes that is correct too!OK

    ill give you different one


    CH3COCHO is called methylglyxal , state any reagents, conditions,observations , one for oxidation and one for reduction (4)
    • Study Helper
    Offline

    3
    ReputationRep:
    (Original post by otrivine)
    No you are good!! `

    I am so happy we have F325 first, I enjoy unit 5 more than unit 4
    Not really and I've barely looked at the last unit :-/

    This A/A* will be quite a challenge!


    Posted from TSR Mobile
 
 
 
Poll
Should MenACWY vaccination be compulsory at uni?

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

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