MCQ
Of the following species the one having a square planar structure is
- A$NH_4^ + $
- B$BF_4^ - $
- ✓$Xe{F_4}$
- D$SC{l_4}$

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$(A)$ The number of $Cl = O$ bonds in $(ii)$ and $(iii)$ together is two
$(B)$ The number of lone pairs of electrons on $Cl$ in $(ii)$ and $(iii)$ together is three
$(C)$ The hybridization of $Cl$ in $(iv)$ is $sp ^3$
$(D)$ Amongst $(i)$ to $(iv)$, the strongest acid is $(i)$