14. Compound I has a molecular formula C5H10O, and 1H-NMR data shown below: δ 0.95 (d, J = 7 Hz, 6H)
15. What is the coupling constant for the Ha and Hb protons in the 1H NMR spectra of the following c
18. Arrange the following compounds in order of increasing reactivity to electrophilic aromatic subs
20. Select the most reasonable formula for the compounds with the following mass spectral data: M+at
39. 下列鹵素化合物何者最合適利用 malonic ester synthesis 來製備 cyclopentanecarboxylic acid?(A) 1-bromopentane (B) 1,
41. 核磁共振光譜圖中,何種數據最常用來區分 trans-3-chloropropenoic acid 和它的 cis-異構物?(A) 化學位移 (B) 氫的數目 (C) 耦合常數 (D) 訊號的數
42. (2R,3S)-tartaric acid 與(2S,3R)-tartaric acid 的關係為何?(A) enatiomers (B) diastereomers (C) identica