What functional groups are present in the following compound?

Identify the following compound expected to be the most soluble in butane, CH3CH2CH2CH3?

Which atomic orbitals overlap to form the C-H sigma bonding molecular orbitals of acetylene, C2H2?

Identify the base/conjugate base (in that order) in the following reaction:

Which of the following molecules are constitutional isomers?  

Which of the following is a tertiary amine? 

What is the approximate value of the H−C−H bond angles in a methyl anion, CH3−?

Which is the correct Lewis structure for acetic acid (CH3CO2H)?  

Bonus question Consider the shown proton on each molecule below, and select the statement that best explains which compound is more acidic.

Which of the following statements best describes the C–Cl bond in the following compound?