题目
题目

MUF0042 Chemistry Unit 2 - Semester 1, 2025

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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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Question restatement and options: - a) Splitting pattern for a is choose from: singlet, triplet, doublet, quartet. - b) Splitting pattern for b is choose from: quartet, singlet, triplet, doublet. - c) Splitting pattern for c is choose from: quartet, triplet, singlet, doublet. - d) Splitting pattern for d is choose from: doublet, quartet, singlet, triplet. - e) For the molecular ion peaks, choose from: 169 and 170, 168.9 and 170.9, 168 and 169, 168 and 170. - Provided answers: a = doublet; b = triplet; c = doublet; d = singlet; mass peaks = 168 and 170. Analysis of each option: - Part a) Why a would be a doublet in this molecule: The splitting pattern of the proton labeled a is determined by the number of equivalent protons on the neighboring carbon atoms (n+1 rule). In this structure, the proton(s) adjacent to a couple in a way that effectively halves the multiplicity when there is one dominant coupling partner, leading to a doublet. If a were to couple with two equivalent neighbors, you would expect a triplet; however, the local connectivity and possible exchange-friendly OH environment often reduce visible coupling for OH/acid-hydroxyl-type protons. The observed environment here tends to produce a simpler doublet pattern for a in typical......Login to view full explanation

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