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. 

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?