By acidic hydrolysis, $-\mathrm{CN}$ group changes to $-\stackrel{\underset{||}{\mathrm{O}}}{\mathrm{C}}\mathrm{OH}$ as given below:

$\begin{array}{ccc}\text{I:}& {\text{CH}}_3\underset{\stackrel{|}{\text{CN}}}{\text{C}}\text{HCHO}\stackrel{{\text{H}}_3{\text{O}}^{+}}{\to }{\text{CH}}_3\underset{\stackrel{|}{\text{COOH}}}{\text{C}}\text{HCHO}& \end{array}$

$\begin{array}{ccc}\text{II:}& {\text{CH}}_3\underset{\stackrel{|}{\text{OH}}}{\text{C}}\text{HCN}\stackrel{{\text{H}}_3{\text{O}}^{+}}{\to }{\text{CH}}_3\underset{\stackrel{|}{\text{OH}}}{\text{C}}\text{HCOOH}& \end{array}$

$\begin{array}{ccc}\text{III:}& {\text{CH}}_3\stackrel{\underset{||}{\text{O}}}{\text{C}}\text{CN}\stackrel{{\text{H}}_3{\text{O}}^{+}}{\to }{\text{CH}}_3\stackrel{\underset{||}{\text{O}}}{\text{C}}\text{COOH}& \end{array}$

In which case does the preference group of the nomenclature change?

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is :

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