63. Which molecule below has a significant band in the 1720 - 1780 cm^-1 range of its IR spectrum?
(A) CH₃CH₂CH₂OH
(B) CH₃C≡CCH₂CH₃
(C) CH₃CH₂CH(NH₂)CH₃
(D) CH₃CO₂CH₂CH₃

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