Question

why more electronegative F atom of NF3 make more donation of lone pair of N atom difficult???
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Answer 1

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Whereas in the case of NF3. F is more electronegative then nitrogen therefore it pulls bond pair of electrons towards itself and hence decreases the electron density over nitrogen. This allows nitrogen to accommodate lone pair of electron efficiently and hence it has lower tendency of donate a lone pair of electron.

Answer 2

as it is more electronegative , it's attraction towards the electron of nitrogen is very high , that's why nitrogen is not able to done it's lone pair electron

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