Problem 6.2

a) Explain the nitrogen rule.

b) Apply the nitrogen rule to the compounds below. Do not calculate molecular weights. Simply fill „even“ or „odd“ into the second column!

Molecular composition

C3H8

C6H12O2

C6H11NO

C32H25N3O2S

C8H20N2

C7H9N

C3H6BrN

C9H11ClN4O2

C17H32Cl2

Monoisotopic mass is …

……….

……….

……….

……….

……….

……….

……….

……….

……….

 

c) Consider a radical containing no nitrogen to be cleaved off from an even-mass molecular ion. Will the mass of the fragment be even- or odd-numbered?

d) Consider a molecule containing one nitrogen to be eliminated from a molecular ion containing two nitrogens. Will the mass of the fragment be even or odd-numbered?


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