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2023 The p-Block Elements (Group 13 and 14)Boron Family – Lewis Acidity of Boron Halides Easy Question 3 of 9 in The p-Block Elements (Group 13 and 14)

Amongst the given options, which of the following molecules/ion acts as a Lewis acid?

A $OH^-$

B $NH_3$

C $H_2O$

D $BF_3$

The answer is D.

Solution

BF3 has an incomplete octet on boron, so it accepts a lone pair.

$BF_3$ behaves as Lewis acid due to incomplete octet in valence shell of Boron. Hence it can accept a lone pair of electrons.

Concept BF3 as a Lewis acid

The p-Block Elements (Group 13 and 14) in past papers

9 questions from this chapter have appeared across 4 exam years.