This nucleophile will favor $S_N2$ reactions.
Work Step by Step
1. Use the table of common Nucleophiles on page 216, to compare and determine if this is a strong or a weak nucleophile. - This is a "$RO^-$" molecule, therefore, it is a strong nucleophile. ** Normally, structures with a negative charge or with high polarity are strong nucleophiles. 2. Strong nucleophiles favor $S_N2$ reactions, therefore, this compound does the same.