74. In the infrared spectrum, a compound of formula C4H8O gave an absorption band at 1720 cm-1, but no bands at 2720 - 2830 and 3400 cm-1. What is the compound?
(A) 2-butanone
(B) butanal
(C) cis-2-butenol
(D) trans-2-butenol

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