Write the order of ${\mathrm{K}}_{{\mathrm{a}}_1}$ values of following acids:

How many of the following compounds gives ${\mathrm{CO}}_2$ on reaction with ${\mathrm{NaHCO}}_3.$

, $\mathrm{HCl},$  

 $\mathrm{HCOOH}, {\mathrm{C}}_2{\mathrm{H}}_5-\mathrm{OH}, {\mathrm{CH}}_3\mathrm{COOH},$ 

How many of the following are more acidic than $\mathrm{HCOOH}.$

$\left(\mathrm{i}\right)$   $\left(\mathrm{ii}\right) {\mathrm{CH}}_3-\mathrm{COOH}$ $\left(\mathrm{iii}\right) \overline{\mathrm{O}} {\mathrm{OC}}_{-}{\mathrm{CH}}_2-\mathrm{COOH}$ $\left(\mathrm{iv}\right) \mathrm{NC}-{\mathrm{CH}}_2-\mathrm{COOH}$ $\left(\mathrm{v}\right)$  $\left(\mathrm{vi}\right)$  $\left(\mathrm{vii}\right)$   $\left(\mathrm{viii}\right)$ 

How many of the following compound have less $\mathrm{pKa}$ than benzoic acid:

$\left(\mathrm{i}\right) \mathrm{HCOOH}$ $\left(\mathrm{ii}\right) {\mathrm{CH}}_3\mathrm{COOH}$

 $\left(\mathrm{iii}\right)$  $\left(\mathrm{iv}\right)$  $\left(\mathrm{v}\right)$  $\left(\mathrm{vi}\right)$  $\left(\mathrm{vii}\right)$  $\left(\mathrm{viii}\right)$ 

Give the decreasing order of nucleophilic addition reaction of the following :-

 $\left(\mathrm{i}\right) \mathrm{HCHO}$

 $\left(\mathrm{ii}\right) \mathrm{PhCHO}$

 $\left(\mathrm{iii}\right) {\mathrm{CH}}_3-\mathrm{CHO}$

$\left(\mathrm{iv}\right)$ Acetophenone

The number of products formed in the following reaction(s) is/are

The products obtained in the above reaction is-