[2018]
(a) $Ga$
(b) $\mathrm{Al}$
(c) $\ln$
(d) $\mathrm{B}$
Correct Answer: 12.(d)
Solution: (d) $M \mathrm{~F}_6^{3-}$
Boron belongs to $2^{\text {nd }}$ period and it does not have vacant $d$-orbital.
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