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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$F - H - \frac{a}{{}} - - {F^ - }$ $F - H - \frac{b}{{}} - - F$
$O - H - \frac{c}{{}} - - N$ $O - H - \frac{d}{{}} - - O$