OCR A2 Chains, Rings & Spectroscopy Watch

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froggymills
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#21
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#21
ohh yeah just read, 'Of the twenty amino acids only glycine does not have a chiral centre'
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El Stevo
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#22
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the very part of the last question... a triplet between 1.2 and 1.4 with area 1, though i am not sure the area needed to be specified...
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froggymills
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#23
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(Original post by El Stevo)
the very part of the last question... a triplet between 1.2 and 1.4 with area 1, though i am not sure the area needed to be specified...
I didnt think that the nmr question was that hard at all! It was quite resonable.
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El Stevo
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#24
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it is probably the first nmr question i have ever got right... i was away we did the whole spec/nmr thing...
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froggymills
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#25
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Wat did people put about the important of nitration of benzene?
I put formation of azo dyes and formation of the polymer poly(nitrobezene) - couldnt think of anything else!
Is the formation of the explosive TNT done by nitration or Friedal Crafts?
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froggymills
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#26
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Just looked on the sylabus. It says:

understand that reactions of arenes, such as those in (b), are used by industry during
the synthesis of commercially important materials, for example: explosives,
pharmaceuticals and dyes (from nitration).

I hope they let me have poly(nitrobenzene)
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El Stevo
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#27
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i think i put explosives and paint, azo dyes being used in paints... i didn't know ploynitrobenzene was that important a polymer, for example poly[chloroethene]
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rainjan_4now
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#28
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jeez, what an exam!

i have to say that i didnt do as good as i thought- especially the question on deducing the amount of electrons in the two rings- i just 4got how to work it out!

my savour was the bit on azo-dyes though!
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El Stevo
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#29
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back to the polymerisation question... i said addition, and the monomer was erm... i could draw it... it was like ethene but with one of the H replaced with a benzene ring...
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froggymills
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#30
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I still so confused about the phenol and amine question! Wat did u have to do?
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froggymills
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#31
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(Original post by rainjan_4now)
jeez, what an exam!

i have to say that i didnt do as good as i thought- especially the question on deducing the amount of electrons in the two rings- i just 4got how to work it out!

my savour was the bit on azo-dyes though!
That question was HORRIBLE and totally left it out! I felt it was quite hard! It was too much for 5 marks!
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froggymills
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(Original post by El Stevo)
back to the polymerisation question... i said addition, and the monomer was erm... i could draw it... it was like ethene but with one of the H replaced with a benzene ring...
phenylethene
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El Stevo
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#33
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#33
(Original post by froggymills)
phenylethene
thats the one!
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froggymills
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#34
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Please please please please tell me!
For the azo dye question at the bottom of the page did u only have to draw phenol and phenylamine??
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rainjan_4now
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(Original post by froggymills)
That question was HORRIBLE and totally left it out! I felt it was quite hard! It was too much for 5 marks!
for myself it was easy because i really concentrated revising it, but i got stupid questions wrong, like being unable to explain the peak around 3ppm of the nmr spectrum.

i hope everyone drew the 2nd isomer (the one with the methyl group) in the box. if not i am *****D!

last question was alright- i basically learnt about d20 on the bus to college!!
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El Stevo
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#36
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(Original post by froggymills)
That question was HORRIBLE and totally left it out! I felt it was quite hard! It was too much for 5 marks!
we'd done the prac at the beginning of the year, so i was trying to regurgitate that... making nitrous acid, reacting all under 10 degrees (in the prac i hit 40 ) and then adding sodium nitrite i think...
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rainjan_4now
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#37
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(Original post by froggymills)
Please please please please tell me!
For the azo dye question at the bottom of the page did u only have to draw phenol and phenylamine??
that what i did! :confused: but with a N2+CL- GROUP ON THE AMIDE
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mistry
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#38
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hey i did that paper.... know what u mean when it was odd because there were no "draw a mechansim for this" or many reaction question etc. What did u get for the materials that nitrobezene is used for. Also for the pi pond question i put 12 and 11.. y is it 6.... well atleast its over now
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rainjan_4now
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#39
(Original post by mistry)
hey i did that paper.... know what u mean when it was odd because there were no "draw a mechansim for this" or many reaction question etc. What did u get for the materials that nitrobezene is used for. Also for the pi pond question i put 12 and 11.. y is it 6.... well atleast its over now
i really *****d up that question! :mad:
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froggymills
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#40
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(Original post by El Stevo)
we'd done the prac at the beginning of the year, so i was trying to regurgitate that... making nitrous acid, reacting all under 10 degrees (in the prac i hit 40 ) and then adding sodium nitrite i think...
ohh no I loved the azo dye question, I meant deducing the electron that was hard! I love azo dye....that sounds weird...I meant it was a good question..lol
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