why does back boding occur in

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

but not in

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

 

 

 

Answers (1)

CONDITIONS FOR BACK BONDING:

(1) Both of the atoms bonded with back Bonding are must be present in the 2nd-2nd or 2nd-3rd period.

(2) One of the atoms has lone pair and another has vacant Orbital and the direction of back Bonding depends upon vacant Orbital.

(3) The donor atom must have localized donatable electron pair.

P\left ( SiH_{3} \right )_{3}  is not satisfy the first condition.

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