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प्रश्न
\[\ce{BF3}\] does not have proton but still acts as an acid and reacts with \[\ce{NH3}\]. Why is it so? What type of bond is formed between the two?
उत्तर
\[\ce{BF3}\] does not have a proton but still it acts as a Lewis acid as it is an electron pair acceptor and reacts with \[\ce{NH3}\] by accepting its lone pair of electrons. The reaction can be represented by Coordinate bond is formed between \[\ce{BF3}\] and \[\ce{NH3}\]. It can be represented as-
\[\ce{[BF3 <- :NH3]}\]
Nitrogen acts as lone pair donator in this combination.
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| Species | Conjugate acid |
| (i) \[\ce{NH3}\] | (a) \[\ce{CO^{2-}3}\] |
| (ii) \[\ce{HCO^{-}3}\] | (b) \[\ce{NH^{+}4}\] |
| iii) \[\ce{H2O}\] | (c) \[\ce{H3O+}\] |
| (iv) \[\ce{HSO^{-}4}\] | (d) \[\ce{H2SO4}\] |
| (e) \[\ce{H2CO3}\] |
Acidity of BF3 can be explained on the basis of which of the following concepts?
