Bertybassett
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For this paper, I couldn't do some of the questions. For question 4, it asks for which has not got a singlet. If the carbon is bonded to an o, and an h, does this mean it has a singlet. Also, if a carbon is bonded to two other carbons, how do you which to use? Similarly, for question 6 I had a similar issue. How do you work this one out? For question 7, does 6:1 mean that one h environment has 8 hydrogens in and the other has 1 (and in that ratio)? For question 8, what is this molecule, what is the structure? Many thanks https://pmt.physicsandmathstutor.com...oice)%20QP.pdf
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BobbJo
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4
A is HCOOCH2CH2CH2CH3
B is CH3COOCH2CH2CH3
C is CH3CH2COOCH2CH3
second C is CH3CH2CH2COOCH3

the answer is the first C. for a singlet, there needs to be no adjacent protons next to the protons causing the singlet
the protons causing the singlet peaks in the other options is underlined

6
A CH3CH2COOCH2CH3
B HCOOCH2CH2CH3
C CH3CH2COCH2CH2CH3
D CH3CHClCH2CH3

the answer would be B
the proton causing the singlet is colour coded

integration reveals the ratio of one type of hydrogen to another within a molecule
Intensities of peaks reveals the ratio of the types of hydrogen

7 the major organic product is CH3CHBrCH3
there are 2 peaks with ratio 6:1
so D

8 (CH3)2CHCOO(CH2)3CH3
CH3CH(CH3)COOCH2CH2CH2CH3
it is butyl 2-methylpropanoate
it is the ester formed from the primary alcohol CH3CH2CH2CH2OH (butan-1-ol) and the acid 2-methylpropanoic acid
There should be 6 peaks
(CH3)2CHCOOCH2CH2CH2CH3
colour coded the different protons
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