MCQ
Consider
The correct order of their acidity is 
- ✓$II > I > III > IV$
- B$II > III > I > IV$
- C$IV > III > IV > I$
- DNone of these
The correct order of their acidity is 

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

$x$ and $y$ mole consumed. Value of $x + y =$
(Given atomic number $\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}$ : $24, \mathrm{Mn}: 25, \mathrm{Fe}: 26)$