Question

Acidity of BF₃ can be explained on the basis of which of the following concepts?
(a) Arrhenius concept
(b) Bronsted Lowry concept
(c) Lewis concept
(d) Bronsted Lowry as well as Lewis concept

Answer 1

it can be explained on the basis of Lewis concept as:

According to Lewis concept, a positively charged or an electron deficient species acts as Lewis acid. BF3 is an electron deficient compound with B having 6 electrons only.

Answer 2

Acidity of BF₃ can be explained on the basis of Lewis concept.

Explanation:

According to Arrhenius concept, an acid is defined as a substance which donates hydrogen ions (H^+) in water.  $HCl\rightarrow H^++Cl^-$

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons.

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs. $BF_3$ can accept electron pairs as it has sextet of electrons and can accept two electrons to complete its octet.

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