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Standard XII
Chemistry
Valence Bond Theory
Why AlCl3 is ...
Question
Why
AlCl
3
is a Lewis acid?
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Solution
Lewis theory of acid and base
Any species (molecule or ion) that can accept a pair of electrons is referred to as a Lewis acid.
Any species (molecule or ion) that can donate a pair of electrons is referred to as a Lewis base.
When a base provides a pair of electrons to an acid, a Lewis acid-base reaction occurs.
Aluminum chloride
Aluminum chloride
AlCl
3
is a Lewis acid because it can receive electrons.
Structure of Aluminum chloride:
The presence of high electron negative chlorine
Cl
atoms decreases the electron density from the core atom.
Aluminum
Al
possesses unoccupied orbitals and is a powerful electrophile (electron deficient species).
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