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OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD

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Original post by ranz
ImageUploadedByStudent Room1465850837.024582.jpg how h envirtoments?


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7?
Original post by itsConnor_
we dont need to know of structure right?


um maybe not but it's easier to figure out if it's learnt rather than the full name of it :/
Original post by ranz
i think that it just doesnt reduce with Nabh4 but can be in general


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it cannot reduce with NaBH4 but LiAlH4 ,a stronger reducing agent.
I thought all the H in benzene are in the same environment, at least at A level
Time to rest, best of luck to all tomorrow!
Original post by yoda123
I thought all the H in benzene are in the same environment, at least at A level


not if youve got substitutions
Original post by ranz
ImageUploadedByStudent Room1465850837.024582.jpg how h envirtoments?


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i think:
proton: 4, carbon: 8
Original post by lai812matthew
i think:
proton: 4, carbon: 8


Original post by itsConnor_
not if youve got substitutions


Original post by yoda123
I thought all the H in benzene are in the same environment, at least at A level


im thinking of carbon environments, so sorry!!!!! ignore me
[QUOTE="ranz;65747519"]ImageUploadedByStudent Room1465850837.024582.jpg how h envirtoments?


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You will see 4
Original post by ranz
ImageUploadedByStudent Room1465850837.024582.jpg how h envirtoments?


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6 proton environment
Original post by ranz
ImageUploadedByStudent Room1465850837.024582.jpg how h envirtoments?


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To correct myself, 8 C environments and 4 H environments?
Reply 1371
Avatar for alow
alow
19
Original post by lai812matthew
i think:
proton: 4, carbon: 8


Nope

Original post by Chem1stry101
Original post by ranz
ImageUploadedByStudent Room1465850837.024582.jpg how h envirtoments?


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You will see 4


Nope
Original post by alow
Nope



Nope


You will see a 5H multiplet for the benzene ring

Two triplets for the 2 CH2 groups

One singlet for the CH3 group

So 4 hydrogen environments
(edited 7 years ago)
Original post by alow
Nope



Nope


10? i am shate at this lol. yeah i got wrong at the proton environment.
(edited 7 years ago)
Surely 3 proton enviroments?

HC-C=0 singlet
HC-O Triplet
HC-Benzene triplet

My bad forgot benzene. in that because benzene has 4 aromatic H environments too there will be 7 in total? for H NMR

I think there are 8 C enviroments
(edited 7 years ago)
https://faculty.missouri.edu/~glaserr/3700s11/SW11A06_Bronze1.pdf
i don't understand where there would be 12 carbon environments for phenolphthalein
Original post by ranz
ImageUploadedByStudent Room1465850837.024582.jpg how h envirtoments?


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6 proton environments, it's just that on an NMR spectrum the 3 benzene environments will appear as one messy peak.
Reply 1377
Avatar for alow
alow
19
Original post by Chem1stry101
You will see a 5H multiplet for the benzene ring

Two triplets for the 2 CH2 groups

One singlet for the CH3 group

So 4 hydrogen environments


Do you know what "multiplet" means? The benzene has 3 environments, each of which will produce probably doublets, triplets or doublets of doublets, depending on the resolution of the NMR.
(edited 7 years ago)
I think its 4

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Reply 1379
Avatar for alow
alow
19
Original post by ReeceM1
6 proton environments, it's just that on an NMR spectrum the 3 benzene environments will appear as one messy peak.


The 3 environments would be fairly distinct and assignable, especially on the BS spectra they give you at A Level.

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