Give reason:  

(i) $\mathrm{Cl}-{\mathrm{CH}}_2\mathrm{COOH}$ is a stronger acid than ${\mathrm{CH}}_3\mathrm{COOH}.$

(ii) Carboxylic acids do not give reactions of carbonyl group. 

(i) $\mathrm{Cl}-{\mathrm{CH}}_2\mathrm{COOH}$ is a stronger acid than ${\mathrm{CH}}_3\mathrm{COOH}.$ This is because -Cl group in $\mathrm{Cl}-{\mathrm{CH}}_2\mathrm{COOH}$ exhibits -I effect. Due to which -ve charge on carboxylate ion get stabilized.

(ii) The lone pair of electrons on the O-atom of -OH group undergoes into resonance. It decreases the electrophilic character. Due to which the partial positive charge on carbonyl carbon atom become less.Therefore, they do not show nucleophilic addition reactions.