29. Which compounds have 3 signals in the 13C NMR spectrum? (A) I, II (B) III, IV (C) I, II, III (D) I, III, IV (E) I, II, III, IV

30. Using a 300 MHz 1 H NMR instrument, if a H shows a triplet at δ 4.02, 4.00, 3.98 ppm, please calculate it’s coupling constant. And where will this triplet peak shows up at a 600 MHz 1 H NMR instrument? (A) 6 Hz; δ: 4.01, 4.00, 3.99 ppm (B) 6 Hz;δ: 4.02, 4.00, 3.98 ppm (C) 6 Hz; δ: δ: 4.00, 3.98, 3.96 ppm (D) 2 Hz; δ: 4.02, 4.00, 3.98 ppm (E) 2 Hz; δ: 4.00, 3.98, 3.96 ppm.

29. Which compounds have 3 signals in the¹³C NMR spectrum?
(A) I, II
(B) III, IV
(C) I, II, III
(D) I, III, IV
(E) I, II, III, IV

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