Define back bonding and explain its affects on acid strength.

Back bonding: A compound in which an atom has lone pair of electrons and another has vacant orbital placed adjacent to each other. This bonding makes the compound to be stable as it completes the compound will satisfy the octet rule In π back bonding electrons move from atomic orbital of one atom to π* atomic orbital of another atom. This feature is effective only when the size of valence shell matches. For acidic strength BF3, BBr3, are Lewis acid because the central atom is lacking a pair of electron. Effectiveness of back bonding with Boron decreases down the Halogen group

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