Question

Given,$B{F_3}$ is:
A.Lewis acid
B.Lewis base
C.Bronsted acid
D.Arrhenius acid

Answer 1

Hint: Lewis acids and bases are electron-pair acceptors and electron-pair donors, respectively, according to the Lewis theory of acid-base reactions. As a result, a Lewis base can transfer two electrons to a Lewis acid, resulting in a product with a coordinate covalent bond.

Complete answer:
Lewis acids are chemical compounds with vacant orbitals that can accept electron pairs from Lewis bases. Chemical entities with a trigonal planar structure and an empty p-orbital were previously referred to as trigonal planar species.
In the Friedel-Crafts alkylation process, Lewis acids play an important role as a catalyst in the Friedel-Crafts reaction – $AlC{l_3}$ takes a lone pair of electrons from the chloride ion, resulting in the production of $AlC{l_4}$. This also results in the creation of the extremely electrophilic carbonium ion, which functions as a powerful Lewis acid.
Lewis bases are atomic or molecular chemical species with a highly confined HOMO (Highest Occupied Molecular Orbital). These chemical entities are capable of donating an electron pair to a Lewis acid to create an adduct.
Lewis bases have a lot of uses when it comes to changing the selectivity and activity of metallic catalysts. Several Lewis bases can make a large number of bonds with Lewis acids. These compounds are also known as "multidentate Lewis bases" or "chelating agents," and they have a variety of industrial and agricultural uses.
From the above discussion, it is clear that $B{F_3}$ is a lewis acid.
So, the correct option is (A).

Note:
Because it cannot receive an electron pair, hydrochloric acid cannot be categorised as a Lewis acid. This molecule, on the other hand, dissociates into its constituent ions, releasing H+ ions (which are considered as Lewis acids). Hydrochloric acid is referred to as a classical acid rather than a Lewis acid due to its inability to take electron pairs.