Why is there no back bonding in

P\left ( SiH_{3} \right )_{3}

whereas, there is  backbonding in

\left ( SiH_{3} \right )_{3}N

though both P and N have a lone pair, and Si, having a vacant d orbital, is present in both compounds?

 

why does back boding occur in

\left ( SiH_{3} \right )_{3}N

but not in

P\left ( SiH_{3} \right )_{3}

 

 

 

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