Caffeine Fragmentation Diagram (13 points) Fragment A Fragment B Fragment F CH3

Question

Caffeine Fragmentation Diagram (13 points) Fragment A Fragment B Fragment F CH3 Fragment C Fragment D Fragment E Lost fragments: -Co Fragment G CHO Complete the diagram with the correct m/z value and associate a lost fragment (1-6) to each of the boxes. 1. (10 pts) Label and attach to your report your mass spectra of dichloromethane and caffeine. On s above. the gas (2 pts) Identify the parent ion of caffeine. What is the m/z value? (3 pts) Suggest a chemical formula for the species that gives an ion ONE mass unit greater than 2. 3. the parent ion. 4. (2 pts) Draw the neutral fragment lost from the parent ion of caffeine that has a mass (m.u.) of 29. 15

Explanation / Answer

Fragment. m/z

A . 194

B . 165

C . 137

D . 109

E. 82

F. 67

G . 55

Fragment A is the parent ion and it's m/z value is 194.

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