a$.$ Using the mass spectrum calculate the molecular formula for the unknown compound. Provide details explaining how you determined and confirmed the presence of any atom other than carbon. Show detailed work.

b$.$ Calculate the IHD of the molecular formula determined above. Show work.

c$.$ Explicitly draw the structure of the two charged fragments indicated below from the mass spectrum. The structure should show a correctly place charge, no brackets.

d$.$ Identify the following three absorptions in the infrared spectra of the unknown. $2978c{m}^{-1}=,1761c{m}^{-1}=,1128c{m}^{-1}=$

e$.$ Propose a structure for the unknown molecule.

Mass Spectrum