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Give the order of (a) nucleophilicity (b...

Give the order of `(a)` nucleophilicity `(b)` basic character, and `(c)` fugacity of the following :
(i) `F^(Ө)`
(ii) `Cl^(Ө)`
(iii) `Br^(Ө)`
(iv) `I^(Ө)`.

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(a) and (c) : `(iv) gt (iii) gt (ii) gt (i) (I^(Ө) gt Br^(Ө) gt Cl^(Ө) gt F^(Ө))` , `(b)` reverse.
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