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

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    (Original post by lai812matthew)
    almost every reaction uses conc acid except diazotisation which uses dilute HCl i think?
    I always say you use dilute HCl for acid hydrolysis of esters
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    (Original post by ImNervous)
    All hydrolysis reactions use dilute acid and alkali
    hydrolysis of peptides? you can still use conc acid/ alkali for normal hydrolysis, it will get the same product, only diazotisation where you need mild conditions to get the unstable diazonium ion i think.
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    (Original post by Lularose83)
    Does anyone know if dilute, excess acid or alkali is used in any of the hydrolysis reactions? It keeps popping into my head and I can't remember what it's used for!!
    hydrolysis of ester dilute acid,
    esterfication conc acid


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    (Original post by lai812matthew)
    almost every reaction uses conc acid except diazotisation which uses dilute HCl i think?
    In the cgp book it says dilute acud us used for ester hydrolysis!
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    (Original post by Lularose83)
    In the cgp book it says dilute acud us used for ester hydrolysis!
    yes dilute for hydrolysis


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    bricking it, we would've been done by now if it was at 9
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    guys just did a legacy paper, and the m.s confused me Name:  ImageUploadedByStudent Room1465902350.803376.jpg
Views: 153
Size:  102.4 KB how many peaks would this have and how many splitting? one peak right, and is a triplet?


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    What's the best way to structure NMR questions?
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    What did the ms say? There would be a peak due to the aldehyde protons and another due to the hcc=O protons?
    (Original post by ranz)
    guys just did a legacy paper, and the m.s confused me Name:  ImageUploadedByStudent Room1465902350.803376.jpg
Views: 153
Size:  102.4 KB how many peaks would this have and how many splitting? one peak right, and is a triplet?


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    (Original post by ranz)
    guys just did a legacy paper, and the m.s confused me Name:  ImageUploadedByStudent Room1465902350.803376.jpg
Views: 153
Size:  102.4 KB how many peaks would this have and how many splitting? one peak right, and is a triplet?


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    (Original post by maisym00)
    What did the ms say? There would be a peak due to the aldehyde protons and another due to the hcc=O protons?
    sorry forgot to mention d2o was used, the m.s says just one peak with no splititng, but isnt it one peak with triplet
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    With C=O bonds, what does it mean 'pi bonds electrons unavailable due to polarisation'
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    What would the splitting pattern of butane be?
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    (Original post by ranz)
    sorry forgot to mention d2o was used, the m.s says just one peak with no splititng, but isnt it one peak with triplet
    Ah, I see where you're coming from, but I think because the molecule is symmetrical the protons are equivalent and equivalent protons won't split eachother?
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    (Original post by maisym00)
    Ah, I see where you're coming from, but I think because the molecule is symmetrical the protons are equivalent and equivalent protons won't split eachother?
    oh they dont? i recall a paper where they showed me a symmetrical compound and it did have splitting
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    Do Hs in the same environemnt split each other

    edit: no they don't split each other so it would be one peak, no split
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    (Original post by yoda123)
    Do Hs in the same environemnt split each other
    no
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    (Original post by yoda123)
    Do Hs in the same environemnt split each other
    No
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    Dumb question but what is CHOCH2CHO even called? And in the nmr spec, would you see splitting??
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    (Original post by Lularose83)
    Dumb question but what is CHOCH2CHO even called? And in the nmr spec, would you see splitting??
    propane-1,3-dial? Yeah CH2 would be triplet and CHO would be triplet
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    (Original post by yoda123)
    Do Hs in the same environemnt split each other

    edit: no they don't split each other so it would be one peak, no split
    what about ch3ch2ch2ch3


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