Ncert Exercises & Solutions

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

$B F_{3} + N H_{3} \to F_{2} B . N H_{3}$

Boron atom in ${BF}_{3}$ is sp $^{2}$ hybridized. The orbital picture of boron in the excited state can

be shown as:

Nitrogen atom in ${NH}_{3}$ is sp $^{3}$ hybridized. The orbital picture of nitrogen can be represented
as:

After the reaction has occurred, an adduct F $_{3}$ BNH $_{3}$ is formed as hybridization of ‘B’ changes to sp $_{3}$ . However, the hybridization of ‘N’ remains intact.

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