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A nucleophile is a Lewis base, i.e. an electron pair donor. Any reagent that contains an atom with at least one lone pair of electrons is a potential nucleophile. Common examples include halide ions such as -:I and -:Br, hydroxide ion , -:OH, water, H2O:, and ammonia, :NH3.
is ur doubt regarding when SN1 or SN2 takes place????/
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