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

the only hard thing of splitting is CH3-CH2-CH3 which they ask once in this spec only, and never in the last spec i think.

Why though..?

that would be a septet or just multiplet
you'd say it's adjacent to 2xCH3

it would not be in a high resolution NMR.

They'll surely tell you the compound is a halogenoalkane then tell you to work out its structure right? There wouldn't be a peak for bromine would there?

why wouldn't it be?

Just like the oxygen shields hydrogen atom in OH to produce a splitting, does Nitrogen to the same for NH2?

it would be a quartet of quartets. cuz you take the highest number of neighbouring protons in consideration first. (3) then the one with less number of neighbouring protons (it is still 3). so i think it would be a quartet of quartets. my teacher got very angry when he saw the answer allows heptet.

(p.s. this is not in the spec and you can write heptet !!!!!!)

Please, stop making our lives more difficult, most of us find NMR on the spec hard enough lol.

i fear that one day they would not allow this and we will all cry at the exam room

cuz you take the highest number of neighbouring protons in consideration first. (3) then the one with less number of neighbouring protons (it is again 3). n+1 rule, so it would be a quartet (the one with more protons) of quartets (the one with less protons) i think. my teacher got very angry when he saw the answer allows heptet.

(p.s. this is not in the spec and you can write heptet !!!!!!)

Yeah, I got confused about that one when I was doing it, but my teacher said not to worry about the splitting of any benzene peaks, apparently it's higher level than A level.

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Do trans unsaturated fats have higher melting points because they pack closely together?

yes more points of contact so stronger intermolecular forces require more energy to break

Do trans unsaturated fats have higher melting points because they pack closely together?

can someone pls help me, the exams hours away and nothings sticking into my head and i can't even do a full past paper yet LOL

Do trans unsaturated fats have higher melting points because they pack closely together?