Question

Show the fragmentations that give rise to the peaks at m/z 43, 57, and 85 in the mass spectrum of 2,4-dimethylpentane (Figure 12-17).

Short answer

Answer

Step-by-step solution

2,4-dimethylpentane

The given compound 2,4-dimethylpentane has has three types of carbons in it. They are primary, secondary, and tertiary. Its structure is shown below.

Structure of the given compound

Peat at m/z 43

Solution: fragmentations of 2,4-dimethylpentane

molecular mass(m/z) of 2,4-dimethylpentane is 100.

Formation of m/z 43 ion:

Peak at m/z 43

Peat at m/z 57

Formation of m/z 57 ion

Peak at m/z 57

Peat at m/z 85

Formation of M/z 85 ion

Peak at m/z 85