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Question
\[\ce{BF3}\] 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?
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Solution
\[\ce{BF3}\] 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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