KoJie
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Link to question paper: https://pmt.physicsandmathstutor.com...y%201%20QP.pdf

Link to mark scheme: https://pmt.physicsandmathstutor.com...y%201%20MS.pdf

Hello, I'm struggling to understand what the last mark point for question 1e means when it says, 'Two peaks (so not S which would only have one)'.

Does anyone have any ideas? Thanks in advance.
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śilvers
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Hi! I think they were referring to the C-O bonds in structure S and structure T. There are 2 peaks in figure 2, and a peak between 50 and 90 ppm represents a C-O bond. 2 peaks would mean there are 2 different carbon environments. The S structure would have a C-O with the C bonded to a CH2. That’s why there would only be one peak for the S structure since there is only one environment. For structure T, there are 2 different carbon environments. One C that is bonded to O is bonded to a CH2, and the other C bonded to O is bonded to a CH3. That’s why there are two peaks.

Correct me if I’m wrong please.
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KoJie
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(Original post by śilvers)
Hi! I think they were referring to the C-O bonds in structure S and structure T. There are 2 peaks in figure 2, and a peak between 50 and 90 ppm represents a C-O bond. 2 peaks would mean there are 2 different carbon environments. The S structure would have a C-O with the C bonded to a CH2. That’s why there would only be one peak for the S structure since there is only one environment. For structure T, there are 2 different carbon environments. One C that is bonded to O is bonded to a CH2, and the other C bonded to O is bonded to a CH3. That’s why there are two peaks.

Correct me if I’m wrong please.
Ahhhh, I see it now! S, because of the O-H group only has 1 C-O bond, whilst T, due to the O being incorporated into the ring, has two C-O bonds.
You're completely right, I didn't think of that before. Thank you so much for your help!
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śilvers
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(Original post by KoJie)
Ahhhh, I see it now! S, because of the O-H group only has 1 C-O bond, whilst T, due to the O being incorporated into the ring, has two C-O bonds.
You're completely right, I didn't think of that before. Thank you so much for your help!
I’m glad I can help! No worries
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