Chapter 14.24, Problem 27P

Knowing what to look for with respect to isotopic clusters can aid in interpreting mass spectra. How many peaks would you expect to see for the molecular ion in each of the following compounds? At what $\text{m/z}$ values would these peaks appear? (Disregard the small peaks due to

${}^{\text{13}}\text{C}$ and ${}^{\text{2}}\text{H}$.)

$\text{p-Dichlorobenzene}$

$\text{o-Dichlorobenzene}$

$\text{p-Dibromobenzene}$

$\text{p-Bromochlorobenzene}$