For the following reaction, respectively identify the Brønsted-Lowry base and the conjugate base.

Which statement best describes a resonance hybrid?

What is the direction of equilibrium when acetylene (C2H2) reacts with ethoxide (CH3CH2O-) in an acid-base reaction?  

Consider the shown proton on each compound and identify which is most acidic.

The lone pairs of electrons on the nitrogen atom in the following compound are located in which orbital?

The lone pair of electrons in the methyl anion, :CH3–, resides in which orbital?

Delocalization of electrons over two or more atoms ________ a molecule.

Identify the resonance hybrid for the following structure.

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] −?