Q. 404.5( 11 Votes )

Classify the foll

Answer :

Lewis acid is defined as the substance (atom, ion or molecule) which is capable of accepting a pair of electrons.

All cations are Lewis acids because they have a tendency to accept the pair of electrons. Example Ag+


Molecules having a central atom with an incomplete octet. Example BF3



Lewis base is defined as the substance which is capable of donating a pair of electrons.


All anions are Lewis bases because they have a tendency to donate the pair of electrons. Example F-


Molecules in which one of the atoms has got at least one pair of electrons. Example NH3,



a) OH can donate an electron pair. Hence, it is a Lewis base.


b) F can donate an electron pair. Hence it a Lewis base.


c) H+ can accept an electron pair. Hence, it is a Lewis acid.


d) BCl3 is deficient in electron as its octet is incomplete. Hence, it can accept electron pair and is, therefore, a Lewis acid.


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