For each of the following electron-pair displacement reactions, give the curved-arrow notation; identify the nucleophile, the nucleophilic center, the electrophile, the electrophilic center, and the leaving group. Then write the analogous Brønsted acid–base reaction. (That is, imagine the same leaving group attached to a proton electrophilic center.) Identify the Brønsted acid and the Brønsted base in each of the resulting reactions.

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(a) CH3 :O-CH3 + S-CH3 CH3 (b) H3C-CH₂-Br: + :C=N: CH₂ :O:+H3C-S-CH3 CH₂ H3C-CH₂-C=N: + :Br: