Which is the best (strongest) nucleophile for an SN2 reaction? 
Definitions:
Conjugate Acid
A species formed by the reception of a proton (H+) by a base, related to its conjugate base by the difference of one hydrogen atom.
Ethanol
A two-carbon alcohol, commonly known as alcohol, with the chemical formula C2H5OH, used as a solvent, fuel, and in beverages.
Increasing Basicity
A qualitative term describing the trend or pattern observed as the basic character (ability to accept protons) of a series of compounds increases.
Acid-Base Pair
A set of two substances that transform into each other by the gain or loss of a proton.
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