Categorise the following molecules/ions ad nucleophile or electrophile.
(1) `HS^(Ө)`
(2) `BF_3`
(3) `C_2H_5O^(Ө)`
(4) `(CH_3)_3 ddot N`
(5) `C1^(Ө)`
(6) `CH_3 - overset (oplus) C = O`
(7) `:overset (Ө) NH_2`
(8) `overset (oplus) N O_2`.

Explanation

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.