62. Which molecule below has a significant band in the IR at 2220 cm^-1 (medium)?
(A) CH₃CH₂CH₂OH
(B) CH₃C≡CCH₂CH₃
(C) CH₃CH₂CH(NH₂)CH₃
(D) CH₃CO₂CH₂CH₃

考試重點觀念本題測驗的是紅外光譜（IR...