00:01
Here's the mass spectrum that's provided.
00:03
The nominal mass of bromobenzine that is rounded to an integer is 157.
00:11
So if it's charged with a 1 plus charge, the m over z would be 157, which corresponds to this peak right here.
00:21
It appears to have an m plus 2 peak at 159, and it's about the same intensity as 157, suggesting there is bromine, which there should be in the molecular ion peak.
00:38
If, however, we lose the bromine, which has a nominal mass of 80, we're left with 77, and that corresponds to this peak right here.
00:53
So this is just the benzene ring after bromine has left.
00:57
We don't see a plus two peak on this, suggesting bromine is absent.
01:03
So of the options that they have available, does this fragment contain bromine? no, it does not.
01:21
This fragment signal is at m79...