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STD 11 - 4. Chemical bonding and molecular structure — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 4. Chemical bonding and molecular structure4 Marks
MCQ
Which one of the following does not have a pyramidal shape?
  • A
    $(CH_3)_3N$
  • ✓
    $(SiH_3)_3 N$
  • C
    $P(CH_3)_3$
  • D
    $P(SiH_3)_3$
✓

Answer

Correct option: B.
$(SiH_3)_3 N$
b
In case of $N(SiH_3)_3\, N$ atom is $sp^2$ hybridised, the lone pair is present in $2p$ orbital and it is transferred to empty $d$ orbital of $Si$ forming $d\pi  -p\pi $ bond . Hence nitrogen with $sp^2$ hybridization has trigonal planar shape.

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