Bonus question Tryptophan, shown below, is an essential amino acid that is important in the synthesis of the neurotransmitter serotonin.. Rank the indicated protons in order of increasing acidity.

Which of the following resonance structures makes the largest contribution to the hybrid structure of [H2CCHO] −?

Which of the following species is the strongest base?

What is the molecular geometry around the boron atom in BH3?

Which of the following is the correct bond-line structure for CH3C≡C(CH2)3C(CH3)2CH2OCH3?

Tamiflu®, the most effective antiviral drug used to treat avian influenza, has the following structure. Identify the functional groups in Tamiflu®.

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.