Question

OK, now to look at the fragments. This is the most difficult aspect of interpreting MS data, and fortunately you often don't need to do this yourself (let a computer do it!) Consider this spectrum which is for a molecule of formula C3H1.0.(M) - 86. Relative Abundance T 20 0 10 ill 30 40 50 60 70 80 90 m/z This molecule is an aldehyde or ketone with a formula of CsH100. Draw all isomers of this formula that have the carbonyl group and determine which might have fragmentation patterns that would match this one in particular the main fragmentation peak which is at 43. Your clue is to remember the stability of carbocations the more stable the Cformed in a fragment, the more likely it is to form when fragmented.

Answer 1

The given formula of the compound = CHOO The possible Structures (isomers) of this foremcela ës given by - (Having carbonyl grocep) " Dec I) (IV) actual isomer corresponding to this Spectrecem is The given by : i Methyl isopropyl Ketone) Fragmentation patteren - ot (Molecular ( à carbocation most stable, con peak, M2=86) = 43, Base peax) (992 : 43) (=45) (myza ) (M23 74)