For the compound below give the spin-spin splitting that would be observed for each of the protons sets in the ¹H NMR spectrum. A) H_a = triplet H_b = doublet,H_c = quartet B) H_a = singlet H_b = quartet,H_c = triplet C) H_a = singlet H_b = pentet,H_c = quartet D) H_a = triplet H_b = quartet,H_c = singlet E) None of the above.

Question

Quizplus · Accepted Answer

H_a is a singlet because it is not next to any other proton. H_b is a quartet because it is next to 3 equivalent protons (H_a is shielded by the ¹ groups) and has one neighboring proton (H_c) that is not equivalent. H_c is a triplet because it is next to 2 equivalent protons (H_b and H_d) and has two neighboring protons (H_b and H_d) that are not equivalent.

For the Compound Below Give the Spin-Spin Splitting That Would