第九题化学英语题
What is always correct about the molecular ion, M+, in a mass spectrum of a compound?
A. The M+ ion peak has the smallest m/z ratio in the mass spectrum.
B. The m/z ratio of the M+ ion peak gives the relative molecular mass of the molecule.
C. The M+ ion is the most stable fragment formed during electron bombardment.
D. The M+ ion peak has the greatest intensity in the mass spectrum.