Question

According to the lewis definition an acid is a substance that

Answer 1

Substances which can accept a pair of electron are Lewis acids

Eg. BF3, AlCl3..

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Answer 2

A Lewis acid is any species that can accept a pair of electrons. A Lewis base is a species that can donate a pair of electrons to an electron acceptor. The bond formed in a Lewis acid/base reaction is called a coordinate covalent bond.

Examples of Lewis acids based on the general definition of electron pair acceptor include:

the proton (H+) and acidic compounds onium ions, such as NH4+ and H3O+

high oxidation state transition metal cations, e.g., Fe3+;

other metal cations, such as Li+ and Mg2+, often as their aquo or ether complexes.

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