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According to the nitrogen rule, an organic compound containing only C, H, O and one nitrogen atom has a molecular ion peak at an m/z value that is

  1. Aeven
  2. Balways divisible by 14
  3. Calways equal to 28
  4. Dodd

Answer: D

For compounds of C, H, O, halogens, S, P with an odd number of nitrogen atoms the nominal molecular mass is odd. Example: has M = 31. So the molecular ion m/z is odd.
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