It is important to be able to distinguish when an electron pair donor in a reaction is acting as a base or as a nucleophile. The following reactions are elementary reactions. In each case, determine whether the electron pair donor is acting as a Brønsted–Lowry base or as a nucleophile. Then, identify the acid, electrophile, and leaving group, as appropriate. Finally, use arrows to indicate the movement of electrons.

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(a) (b) (c) CH₂S + CH3CH₂0- NH₂ H H₂C CH₂ CH₂CH₂-CI+ H O -CH₂ CH3 Br H 0 CH₂SCH₂CH3 + 0- CH3, H₂C CH₂CH₂ C -0 CH3 H O -CH₂ + NH3 + Br H + CI