71. Which molecule below has two significant bands in the IR at 2720 cm-1 and 2820 cm-1 (medium)?
(A) CH3COCH2CH
(B) CH3CH2CO2CH3
(C) CH3CH2CH2CHO
(D) CH2=CHCH2CH3

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統計： A(0), B(0), C(1), D(0), E(0) #4042052

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