The correct order of $\mathrm{pka}$ is

($\mathrm{I}$) ${\mathrm{CH}}_3\mathrm{COOH}$

($\mathrm{II}$) ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COOH}$

($\mathrm{III}$) ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2\mathrm{COOH}$

($\mathrm{IV}$) ${\mathrm{CH}}_3-\underset{\stackrel{\left|\right|}{\mathrm{O}}}{\mathrm{C}}-{\mathrm{CH}}_2-\mathrm{COOH}$

The correct order of the acidic strength is

The correct order of strengths of the carboxylic acids

is

Arrange the following acids in the decreasing order of their acidic strength:

(I)	(II)	(III)	(IV)

Compare the acidic strength of the given acids

(I)	(II)	(III)	(IV)
${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COOH}$

The order of reactivity of phenyl magnesium bromide $\left(\mathrm{PhMgBr}\right)$ with the following compounds: