Electrophiles

Chemistry Level 2

Which of the following pairs represents a set of electrophiles?

(a) $$\ce{Br+}$$ and $$\mathbf{\colon}\ce{CCl2}$$
(b) $$\ce{H+}$$ and $$\ce{H2O}$$
(c) $$\ce{BF3}$$ and $$\ce{NH3}$$
(d) $$\ce{H-}$$ and $$\ce{AlCl3}$$

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