90. Which compound exhibits only two signals in its 1H NMR spectrum, a triplet and a quintet?
(A) BrCH2CH2CH2Br
(B) BrCH2CH2CH2Cl
(C) (CH3)2CHCH(CH3)2
(D) CH3CH2CH2CH3
(E) (CH3)2CHOCH(CH3)2

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統計： A(19), B(1), C(2), D(5), E(0) #2974253

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#5996731


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