Fill in the blanks:
$(i)$ In $1927$,Heitler and London proposed the ........ theory.
$(ii)$ The ${\rm{ClF}}_3$ molecule has a .... shape.
$(iii)$ The number of bonding pairs in ions with a square planar shape is .......... .
$(iv)$ The value of the dipole moment in ${\rm{HBr}}$ is .......... .

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(N/A) $(i)$ Valence Bond Theory $(VBT)$.
$(ii)$ $T$-shaped.
$(iii)$ $4$.
$(iv)$ $0.79 \ D$.

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