Which of the following apply to the interpretation of mass s

Which of the following apply to the interpretation of mass spectra? Choose all that apply.

a) Exact mass can be used to determine the empirical formula of an unknown

b) Bromine and Chlorine give unique M+1 patterns just like C₁₂ and C₁₃

c) The Nitrogen rulke can be used to determine if nitrogen is present but only if there are an even number of nitrogens

d) The base peak is the largest peak in the spectrum

Solution

Ans a and d

Exact mass can be determined by using modern spectrometric techniques today.

Bromine and chlorine have different M+1 patterns than carbon isotopes because their relative abundance is different

Nitrogen rule says if no or even nitrogen is present, then even molecular mass is obtained , but if odd molecular mass is observed it confirms the presence of nitrogen atom.

And the base peak is largest which is given the abundance of 100 in mass spectra.