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Chemistry
The decreasing order of bond angles in BF3 , NH3 , PF3 and I3- is
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Q. The decreasing order of bond angles in $BF_{3} , NH_{3} , PF_{3}$ and $I_{3}{^{-}}$ is
JEE Main
JEE Main 2018
Chemical Bonding and Molecular Structure
A
$I_3{^{-}} > NH_3 > PF_3 > BF_3$
17%
B
$I_3{^{-}} > BF_3 > NH_3 > PF_3$
42%
C
$BF_3 > I_3{^{-}} > PF_3 > NH_3$
16%
D
$BF_3 > NH_3 > PF_3 > I_3{^{-}}$
24%
Solution:
The shape of the given molecules is as follows:
$BF_3$ : Planar triangle with bond angles of $120^{\circ}$.
$NH _{3}$ : Trigonal pyramidal with bond angles of $107^{\circ} .$
$I _{3}^{-}$ : Linear with bond angles $180^{\circ}$.
$PF _{3}$ : Trigonal pyramidal with bond angles of $97.8^{\circ} .$