Keto and enol forms of a compound are related to each other as:

The correct order of acidity of the following compounds is:​​​​​​

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

$\left(\mathrm{II}\right) {\mathrm{ClCH}}_2\mathrm{COOH}$ 

$\left(\mathrm{III}\right) {\mathrm{O}}_2{\mathrm{NCH}}_2\mathrm{COOH}$  

$\left(\mathrm{IV}\right) {\mathrm{HOCH}}_2\mathrm{COOH}$

The order of basicity is:

$\left(\mathrm{I}\right) \mathrm{Ph}-{\mathrm{CONH}}_2$

$\left(\mathrm{II}\right) \mathrm{Ph}-{\mathrm{NH}}_2$

$\left(\mathrm{III}\right) \mathrm{Ph}-{\mathrm{CH}}_2-{\mathrm{NH}}_2$

$\left(\mathrm{IV}\right) \mathrm{p}-{\mathrm{OCH}}_3\mathrm{Ph}-{\mathrm{NH}}_2$

The order of enol content in the following molecule is: