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

skatealexia
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Hello, thought I'd start the thread =D.
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jimber
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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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skatealexia
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I know o.O. Many many reactions.
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lil_miss_rapunzel
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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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cyborg
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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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xx-becky1992-xx
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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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skatealexia
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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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xx-becky1992-xx
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Yeah that would be good Would help me alot.
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cyborg
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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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Temi08
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I'm glad someone has started this thread, anyone got any good reviosion resourses and sites???
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lil_miss_rapunzel
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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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skatealexia
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cgp is awesome.
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lil_miss_rapunzel
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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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skatealexia
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half of second and half of third module to go
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Liverpool F.C.™
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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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lil_miss_rapunzel
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Still haven't started going through the Analysis module

Hate that unit
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AnthonyShock
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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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student92
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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.
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Woody.
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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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Liverpool F.C.™
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http://www.allinfo.plus.com/levelup/index.htm
http://www.knockhardy.org.uk/sci.htm
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