MCQ
Which is the $CORRECT$ relation of bond angles?
  • A
    $NH_3 > (CH_3)_3N > (SiH_3)_3N$
  • $(SiH_3)_3N > (CH_3)_3N > NH_3$
  • C
    $NH_3 > (SiH_3)_3N > (CH_3)_3N$
  • D
    $(CH_3)_3N > (SiH_3)_3N > NH_3$

Answer

Correct option: B.
$(SiH_3)_3N > (CH_3)_3N > NH_3$
b
$\mathrm{NH}_{3} \quad \mathrm{sp}^{3}: 107^{o}$

$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{N} \quad \mathrm{sp}^{3}: 108^{o}$ -bulky have more

repulsion than smaller $H$

$-\left(\mathrm{SiH}_{3}\right)_{3} \mathrm{N} \cdot \mathrm{sp}^{2}: 120^{o}\, \mathrm{LP}$ of $\mathrm{N}$ engages in back

bonding with empty $d$ orbitals of $Si$

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