MCQ
The most stable ion is
- A$[Fe(C_2O_4)_3]^{3-}$
- ✓$[Fe(CN)_6]^{3-}$
- C$[Fe(CN)_6]^{4-}$
- D$[Fe(H_2O)_6]^{3+}$
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$1\,\,\,$-$\,\,\,2\,\,\,$-$\,\,\,3\,\,\,$-$\,\,\,4$
(Where. $P =$ polar, $NP =$ non-polar)

$BF _{3}+ NaH \stackrel{450 K }{\longrightarrow} A + NaF$
$A + NMe _{3} \rightarrow B$