CNMR and Mass spec Flashcards
what do the number of signals in CNMR represent
the number of carbons in different chemical environments
when looking at a decoupled CNMR, are there spilts in the peaks?
no
when looking at a coupled CNMR are there spilts in the peaks
yes
How many spilts in a CH group
doublet
how many spilts in a CH2 group
triplet
how does a GC/MS wrok
a compound is separated through gas chromatography and then the mass spec separates the components
how many spilts in a CH3 group
quartet
what is the base peak
it is the peak with 100% abundance, it is the most stable carbocation and abundant fragment
what is a radical cation
it is the fragment of the molecule that is now a cation and has an unshared electron
what ratio does Chlorine have?
3:1 due to the 75.5% abundance of Carbon 35 and the 24.5% abundance of Cl 37
what ratio does Br 79 have
1:1 due to the 51.5% Br 79 and 49.5% of Br 81
what is the molecular weight of a methyl group
15 mass units
what is the molecular weight of an ethyl group
29 mass units
what is the molecular weight of a propyl group
43 mass units
