19. What is the IUPAC name of the following compound? 5d5654ed0016e.jpg
(A) (2S,4R)-Dimethylpentanal
(B) (2S,4S)-Dimethylpentanal
(C) (R)-2,4-Dimethylpentanal
(D) (S)-2,4-Dimethylpentanal
(E) (2R,4R)-Dimethlypentanal.

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統計： A(1), B(0), C(4), D(42), E(1) #2053816