What is the approximate value of the H−C−H bond angles in methane, CH4?

Bonus question Which of the following best explains if H2O is a suitable reagent to protonate the compound shown below?

What are the formal charges on boron and oxygen in the following structure?

Bonus question For the following acid-base reaction, predict which side of the equilibrium is favored. 

For the following reaction, identify the Lewis acid and the Lewis base.

Bonus question For the structure shown in the box below identify corresponding correct resonance structures.

What is the relationship between the following compounds? 

Which of the following molecules contain the same functional groups?  

Which of the following represents the ground state electron configuration for nitrogen?

Identify the structure produced by the following acid-base reaction mechanism.