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(D) Let us analyze each molecule:$1$. $ClF_3$: Central atom $Cl$ has $sp^3d$ hybridisation (uses $1$ $d$-orbital) and has $2$ lone pairs.$2$. $PCl_5$:

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$SF_4$

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(D) Let us analyze each molecule:$1$. $ClF_3$: Central atom $Cl$ has $sp^3d$ hybridisation (uses $1$ $d$-orbital) and has $2$ lone pairs.$2$. $PCl_5$: Central atom $P$ has $sp^3d$ hybridisation (uses $1$ $d$-orbital) and has $0$ lone pairs.$3$. $BrF_5$: Central atom $Br$ has $sp^3d^2$ hybridisation (uses $2$ $d$-orbitals) and has $1$ lone pair.$4$. $SF_4$: Central atom $S$ has $sp^3d$ hybridisation (uses $1$ $d$-orbital) and has $1$ lone pair.In $SF_4$,the number of lone pairs on the central atom is $1$ and the number of $d$-orbitals involved in hybridisation is $1$. Thus,they are the same.

In which of the following molecules,the number of lone pairs of electrons on the central atom and the number of $d$-orbitals involved in the hybridisation of the central atom are the same?

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