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

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Reply 1880

Michaelj99

Original post by TSR121

Guys for the ketone on the last question was it 5 carbons in a row then the c=o on the middle carbon ?

I put it in the middle one too! i wasn't sure whether it was specific to anywhere in the middle :s-smilie:

I got this for F

Original post by RealistZ

It's propanoic acid CH3CH2COOH Mr=74

The second product of the ethanoic anhydride reaction was ethanoic acid

I got this for G

Original post by WhatALad

They did 3/94=0.032
0.032/0.61=0.0528
0.0528*135=7.1

It's 0.032* 0.61

Reply 1885

marioman

Original post by ali_t9001

The second product of the ethanoic anhydride reaction was ethanoic acid

You are thinking of a different question.

Reply 1886

KB_97

I got this for H (m/r of 74. Propanoic acid)

Reply 1887

sara3298

Guys how's 2.66 the correct answer? I got that first but then when I did the inverse is didn't give me 61% so I wasn't sure whether that was correct.. I changed my answer to 7.14 cause then I ended up getting a 61% yield but hey if 2.66 is correct then ;(

Reply 1888

Tobyrush100

People have got to remember highest ever boundary was 51/60, paper was average in hardness so A boundary probably around 48/60.

Reply 1889

jasonx2

Anyone got 2.86g for the mass of compound A?

Reply 1890

KB_97

I got this for the ester I

Reply 1891

GawdHeresEmmie

Original post by student.1997

Was compound J (CH3)3C=oCH3

no, (CH3)3CH2OH i believe

I got this for J

What was the proton NMR splitting pattern? :s-smilie:

I think I got doublet multiplet and triplet?

Reply 1894

Yhuikopn

Will you get ecf of you got f wrong?

Reply 1895

fghj1

Can someone do a proper unofficial mark scheme please

Reply 1896

MrKmas508

Original post by KB_97

I got this for F

Is displayed formula okay?

Reply 1897

lauralaaaa

Original post by Yhuikopn

Will you get ecf of you got f wrong?

Yeah I think you would :smile:

Reply 1898

mechanism

For the PLA question on chiral synthesis and using fermentation of sugars, I spoke about producing more than one optical isomer when using chiral synthesis. Is this right? Or is it to do with one being natural and the other isn't?