When an alcohol is diluted in a solvent that cannot form hydrogen bonds with the alcohol, which of the following changes is expected for the IR absorption signal for the O–H bond? Select all that apply. A : Cause the peak to narrow. B : Shift the peak to a higher wavenumber. C : Shift the peak to a lower wavenumber. D : Cause the peak to broaden.
Of the following statements regarding the base peak in a mass spectrum, which are always true. Select all that apply.
A : The base peak is the tallest peak in the spectrum.
B : The base peak corresponds to the peak with the smallest m/z.
C : The base peak corresponds to the peak with the largest m/z.
D : The base peak is furthest to the right.
E : The base peak may not be present in spectrum.
F : The base peak corresponds to the most abundant ion.
please select from the highlighted ones in (). The presence of a bromine atom in a molecule will produce a mass spectrum with an (M+2)+• peak that is approximately (equal to or one-third or one-half) the intensity of the molecular ion peak because the 79Br isotope is found in (equal or greater or less) abundance compared to the 81Br isotope.