Which of protons, 1 to 4, in the following molecule gives a triplet signal in a 1H NMR spectrum?单项选择题

题目图片
A

a. 1

B

b. 2

C

c. 3

D

d. 4

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Question textQ17 V1(5 marks) a) For the following compound, predict the splitting pattern found for the letters, a, b, c and d. (i) Splitting pattern for a is Answer 1 Question 17[select: , singlet, triplet, doublet, quartet] (1 mark) (ii) Splitting pattern for b is Answer 2 Question 17[select: , quartet, singlet, triplet, doublet] (1 mark) (iii) Splitting pattern for c is Answer 3 Question 17[select: , quartet, triplet, singlet, doublet] (1 mark) (iv) Splitting pattern for d is Answer 4 Question 17[select: , doublet, quartet, singlet, triplet] (1 mark) b) For the compound shown above, molecular ion peaks on a mass spectrum would be seen closest to m/z ratio(s) of Answer 5 Question 17[select: , 169 and 170, 168.9 and 170.9, 168 and 169, 168 and 170] (1 mark)

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