apart-from-using-the-molecular-mass-how-else-can-you-determine-that-the-fragment

Question

Apart from using the molecular mass, how else can you determine that the fragment peak at m/z 63 in the below-given mass spectrum for 1-bromo-2-chloroethane includes chlorine, not bromine?

Mass spectrum showing fragment peak at m/z 63, indicating presence of chlorine in 1-bromo-2-chloroethane.

Accepted Answer

The 3:1 ratio of M and M+2 peaks indicates that the fragment ion includes a chlorine atom.

Answer

The intensity of the fragment peak indicates that it includes a chlorine atom.

Answer

The 10:1 ratio of M and M+1 peaks indicates that the fragment ion includes a chlorine atom.

Answer

The 2:1 ratio of M and M+2 peaks indicates that the fragment ion includes a chlorine atom.

Apart from using the molecular mass, how else can you determine that the fragment peak at m/z 63 in the below-given mass spectrum for 1-bromo-2-chloroethane includes chlorine, not bromine?