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Giving justification, categorise the fol...

Giving justification, categorise the following molecules/ions as nucleophile or electrophile:
`HS^(-),BF_(3),C_(2)H_(5)O^(-),(CH_(3))_(3)N,`
`Coverset(+)l,CH_(3)-overset(+)C=O,H_(2)N^(-),, overset(+)NO_(2)`

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Nucleophiles : `HS^(Ө), C_2 H_5 O^(Ө),(CH_3) _3 ddot N, overset (ddot (Ө)) N H_2`
These species have unshareped pair of `overline e^, s` which can be donated and shared with an electrophile.
Electrophilies : `BF_3, C1^(oplus), CH_3 - C^(oplus) = O, overset (oplus) NO_2`
Relative sites have only six valence `overline e^, s` and can accept `overline e` pair from a nucleophile.
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