a. List the ions responsible for the M, [M + 2] and [M + 4] peaks in a mass spectrum of dibromomethane.

b. What would be the mass-to-charge ratio and relative abundances of the major peaks with the highest charge-to-mass ratios in the mass spectrum of chloroethane?

c. How many peaks would you see beyond the molecular ion peak in 1,1-dibromoethane? What would be their mass-to-charge ratios and abundances relative to the molecular ion? (Ignore peaks due to ¹³C.)