2-Propanol to propanone: Why are these representations wrong?

Dear chemists, The two hydrogen atoms shown in red are bound to CuO. Please ignore them. My opinion: One electron from the orange electron pair and one electron from the green electron pair have bound the red electron pair. And the rest are gone. However, if I count the outer electrons, the number is correct….

How do I represent the reaction scheme of three amino acids to form a tripeptide?

Here is the task: Describe the reaction scheme of three amino acids to form a tripeptide. Draw the structural formulas of the amino acids, labeling their side chains R1, R2, and R3, respectively, as well as the structural formula of the tripeptide. I really have no idea what to do and would really appreciate some…