(b) (6 marks) Decide which 'H NMR spectrum (A) or (B) best fits 2-chlorophenol and 4-chlorophenol respectively. Justify your answer. Describe the 'H spin systems of both molecules using Pople notation. The lowest chemical shift for each molecule is from a proton alpha to the -OH group. Why is this the case when oxygen is more electronegative than chlorine? (A) OH CI OH 2-chlorophenol CI 4-chlorophenol 40 7.35 7.30 7.25 7.20 7.15 7.10 7.05 7.00 6.95 6.90 6.85 6.80 6.75 6. ppm (B) 40 7.35 7.30 7.25 7.20 7.15 7.10 7.05 ppm 7.00 6.78 Page 3 of 8

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Author:William Nickels
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Chapter1: Taking Risks And Making Profits Within The Dynamic Business Environment
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(b)
(6 marks)
Decide which 'H NMR spectrum (A) or (B) best fits 2-chlorophenol and 4-chlorophenol
respectively. Justify your answer.
Describe the 'H spin systems of both molecules using Pople notation.
The lowest chemical shift for each molecule is from a proton alpha to the -OH group. Why is
this the case when oxygen is more electronegative than chlorine?
(A)
OH
CI
OH
2-chlorophenol
CI
4-chlorophenol
40
7.35
7.30
7.25
7.20
7.15
7.10
7.05
7.00
6.95
6.90 6.85
6.80
6.75
6.
ppm
(B)
40
7.35
7.30
7.25 7.20
7.15
7.10
7.05
ppm
7.00
6.78
Page 3 of 8
Transcribed Image Text:(b) (6 marks) Decide which 'H NMR spectrum (A) or (B) best fits 2-chlorophenol and 4-chlorophenol respectively. Justify your answer. Describe the 'H spin systems of both molecules using Pople notation. The lowest chemical shift for each molecule is from a proton alpha to the -OH group. Why is this the case when oxygen is more electronegative than chlorine? (A) OH CI OH 2-chlorophenol CI 4-chlorophenol 40 7.35 7.30 7.25 7.20 7.15 7.10 7.05 7.00 6.95 6.90 6.85 6.80 6.75 6. ppm (B) 40 7.35 7.30 7.25 7.20 7.15 7.10 7.05 ppm 7.00 6.78 Page 3 of 8
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