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Q)

Which of the following is the correct order of bond angle

$\begin{array}{1 1}(a)\;PI_3 > PBr_3 > PCl_3\\(b)\; PCl_3 > PBr_3 > PI_3\\(c)\;PI_3 > PCl_3 > PBr_3\\(d)\;PBr_3 > PCl_3 > PI_3\end{array}$

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A)
$PI_3(102^{\large\circ} )> PBr_3(101.5^{\large\circ}) > PCl_3(100^{\large\circ})$
This is due to the bond angle decreases with the increase in electronegativity of a terminal atom.
Hence (a) is the correct answer.
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