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  •  Which one of the following does not have a pyramidal shape?  Option: 1 <img alt="\left ( CH_{3} \right )_{3}N" src="https://entr

 Which one of the following does not have a pyramidal shape?

 

Option: 1

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


Option: 2

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


Option: 3

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


Option: 4

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


Answers (1)

best_answer

P and Si have vacant d-orbital so they can form an additional \pi bond (back bond) with lone pair of N but due to absence of vacant d-orbital C cannot form back bond with lone pair of N that's why shape of (CH_{3})_{_{3}}N is pyramidal.

 

In case of  N(SiH3)3N atom is  sp2 hybridised, the lone pair is present in 2p orbital and it is transferred to empty d orbital of Si forming  dπ−pπ bond. Hence nitrogen with sp2 hybridization has trigonal planar shape.

Therefore, Option(2) is correct

Posted by

himanshu.meshram

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