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The electron ionization mass spectrum of a small neutral molecule shows a base peak at 27 and a smaller peak at 26 with a relative abundance of 20%. Deduce the structure of the unknown compound. Step 1: Identify the molecular ion. Step 2: Look for the presence of Cl or Br based on isotope pattern. Step 3: If the molecular ion is odd or even, this indicates the number of nitrogens. Step 4: Examine the largest peaks and calculate the difference from the molecular ion. Look for common alkyl fragments. Step 5: Draw the structure that best fits the MS data. Step 2: Look for the presence of Cl or Br based on isotope pattern. Chlorine has two common isotopes, 37Cl and 35Cl. A chlorine atom will give a 3:1 ratio of the M and M+2 peak. Bromine has two common isotopes, 81Br and 79Br. A bromine atom will give a 1:1 ratio of the M and M+2 peak. The unknown compound contains? neither chlorine bromine