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Is there any change in the hybridisation of B and N atoms as a result of the following reaction? 

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Boron atom in BF3 is sp2 hybridized. The orbital picture of boron in the excited state can be shown as:

Nitrogen atom in NH3 is sp3 hybridized. The orbital picture of nitrogen can be represented as:

After the reaction has occurred, an adduct F3BNH3 is formed as hybridization of ‘B’ changes to sp3 . However, the hybridization of ‘N’ remains intact. 

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