Which of the following species are formed by Lewis acid-base interaction?

C H_{4}

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B F_{3}

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P C l_{4}^{+}

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N a B F_{4}

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Solution

The correct option is D $N a B F_{4}$
In $N a B F_{4}$ formation, $B F_{3}$ having vacant $p$ -orbital, i.e lewis acid, reacts with $N a F$ i.e lewis base (because of lone pairs in $F^{-}$ ) to form $N a B F_{4}$ via dative bond. $B F_{3}$ accepts the lone pair of electron from $F^{-}$ to form a dative bond.
$B F_{3} + N a F \to N a B F_{4}$

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