19. Which of the following outlines the characteristic pattern observed for an isopropyl group in a¹H NMR spectrum?
(A)The spectrum contains a 1H septet and a 6H doublet
(B) The spectrum contains a 1H sextet and a 6H doublet
(C) The spectrum contains a 1H quartet and a 6H quartet
(D) The spectrum contains a 1H triplet and a 6H quartet
(E) The spectrum contains a 1H doublet and a 6H quartet

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統計： A(16), B(1), C(2), D(0), E(0) #3227632