54. The mass spectra of alcohols often fail to exhibit detectable M peaks but instead show relatively large peaks. (A) M+1 (B) M+2 (C) M-15 (D) M-16 (E) M-18

58. Which of the following statements describes the first step in the mechanism of the aldol condensation? (A) An alpha hydrogen is abstracted by the base to from an enolate anion. (B) A nucleophilic base attacks the carbony1 carbon atom. (C) The carbonyl oxygen is protonated by the base ion. (D) An alpha hydrogen is abstracted by an acid to the enolate anion. (E) none of above.

54. The mass spectra of alcohols often fail to exhibit detectable M peaks but instead show relatively large peaks. (A) M+1 (B) M+2 (C) M-15 (D) M-16 (E) M-18

其他試題

54. The mass spectra of alcohols often fail to exhibit detectable M peaks but instead show relatively large peaks.
(A) M+1
(B) M+2
(C) M-15
(D) M-16
(E) M-18