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Question: Answered & Verified by Expert
Which one of the following does not have a pyramidal shape?
ChemistryChemical Bonding and Molecular StructureJEE MainJEE Main 2014 (11 Apr Online)
Options:
  • A
    $\left(\mathrm{CH}_3\right)_3 \mathrm{~N}$
  • B
    $\left(\mathrm{SiH}_3\right)_3 \mathrm{~N}$
  • C
    $\mathrm{P}\left(\mathrm{CH}_3\right)_3$
  • D
    $\mathrm{P}\left(\mathrm{SiH}_3\right)_3$
Solution:
1188 Upvotes Verified Answer
The correct answer is:
$\left(\mathrm{SiH}_3\right)_3 \mathrm{~N}$
In case of $\mathrm{N}\left(\mathrm{SiH}_3\right)_3 \mathrm{~N}$ atom is $s p^2$ hybridised, the lone pair is present in $2 p$ orbital and it is transferred to empty $d$ orbital of Si forming $d \pi-p \pi$ bond. Hence nitrogen with $s p^2$ hybridization has trigonal planar shape.

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