Caffeine has the following structure. What is the hybridization state and molecular geometry at each nitrogen atom in Caffeine?  Please provide a thorough explanation that allows for undertanding of topic.

What are the major products of the following reaction? Draw all the major products. If there are no major products, then there is no reaction that will take place. Use wedge and dash bonds when necessary.

Tryptophan is an essential amino acid important in the synthesis of neurotransmitter serotonin in the body. What are the hybridization states, molecular geometry and approximate bond angle at the indicated carbon and nitrogen atoms? Please provide a thorough explanation that allows for undertanding of topic.