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OCR Chemistry A F321/F322/F324/F325 Thread (OLD SPEC)

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Original post by Bigzy
That stupid god damn frikkin effin jeffing structure for the last question. I couldn't seem to work it out. I managed to do empirical formula to show molecular formula and listed the different proton environments but couldn't work out the structure of the ester. 🙁


You'll still get quite a few of the marks but i got ImageUploadedByStudent Room1497362372.837888.jpg
I can't remember which way round it was


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Original post by Bigzy
That stupid god damn frikkin effin jeffing structure for the last question. I couldn't seem to work it out. I managed to do empirical formula to show molecular formula and listed the different proton environments but couldn't work out the structure of the ester. 🙁


I think the structure I drew had C6H10O2 fml
Original post by ammaarah01
You'll still get quite a few of the marks but i got ImageUploadedByStudent Room1497362372.837888.jpg
I can't remember which way round it was


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I'm pretty sure a peak at 4.9 meant there was a C=C bond ?
Original post by robinhood111
I'm pretty sure a peak at 4.9 meant there was a C=C bond ?


the 4.9 peak was supposed to be 1 to the right, ie 3.9
It was such a nice paper
i'm soooo scared i found it nice last year as well
(edited 6 years ago)
Original post by ammaarah01
You'll still get quite a few of the marks but i got ImageUploadedByStudent Room1497362372.837888.jpg
I can't remember which way round it was


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I got the first picture as the structure :tongue: I said it was 2 propyl propanoate (dont think u was asked to name it but w/e lol)
Original post by Parametric
the 4.9 peak was supposed to be 1 to the right, ie 3.9


Why is that ?
Original post by robinhood111
Why is that ?


It said at the bottom of the question page
Reply 68
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Bigzy
2
Thought it was 4 proton environments?
Reply 69
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Oooooooa
I agree! But found the 6 marker on polymers hard
That was a reaaaally nice paper. Just like last year it was too good to be true, expect 59 for an A :biggrin:.
But wth is a cyclic tripeptide.
Did anyone figure out the mechanism with CN!?


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Original post by Parametric
It said at the bottom of the question page


I didn't sign up for this smh
Original post by Oooooooa
I agree! But found the 6 marker on polymers hard


Did you figure it out


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Reply 74
Avatar for Bigzy
Bigzy
2
Did it say 1 to the right?
Original post by ammaarah01
Did anyone figure out the mechanism with CN!?


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Normal nucleophilic addition, CN attacks the Carbon and the O double bond breaks and then oxygen attacks the proton
Who 61.2 for the percentage yield
Original post by ammaarah01
You'll still get quite a few of the marks but i got ImageUploadedByStudent Room1497362372.837888.jpg
I can't remember which way round it was


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I got the first one. It was mean that they put the bit about it actually being 3.9 at the bottom lol
Who got F is an electrophilic sub reaction
and G is a nucleophilic sub reaction
Just realised i got the reaction wrong for NO2 to NH2 forgot to double the [H] 😬


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