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  4. The F-Br-F bond angles in BrF5 and the Cl-P-Cl bond angles in PCl5, respectively, are

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Q. The $F-Br-F$ bond angles in $BrF_5$ and the $Cl-P-Cl$ bond angles in $PCl_5$, respectively, are

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Solution:

The geometry of $BrF_5$ is square pyramidal.
image
Here, the lone pair occupies the axial position and hence axial bonds will suffer more repulsion than axial bonds.
Thus, the axial $Br—F$ bond length will be different than equitorial $Br—F$.
The geometry of $PCl_5$ is triangular pyramidal.
image
The axial bonds suffer more repulsions than equitorial bonds, so they are larger in bond length.