Which one of the following molecular hydrides acts as a Lewis acid?
Lewis acid is defined as a species that can accept a lone pair of electrons and are electron deficient species.
has a complete octet,
has one and two lone pairs of electrons respectively hence are lewis bases. While
is an electron-deficient species and acts as lewis acid.
In , Boron accepts lone pair of electrons in
orbitals.
The correct answer is option 4
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