Ethyl acetate can be prepared by an sn2 reaction. draw the alkylbromide and nucleophile used in the reaction. remember to include formal charges (do not include counterions).

The reaction that requires an alkyl halide and a alkoxy ion to form an ether is called the williamson ether synthesis. the mechanism of the reaction follows the sn2 reaction, where there is a simultaneous breaking and formation of bonds. 

for the synthesis of ethyl acetate, the alkylbromide would be ethyl bromide and the nucleophile would be the sodium acetate ion. the reaction is drawn in the attached image.