From the following reactions, identify the reactions that give carboxylic acids as products:
(i) CH$_3$CH$_2$CH$_2$CH$_2$OH \xrightarrow{1)\text{KMnO}_4/\text{KOH } 2)\text{Dil. H}_2\text{SO}_4
(ii) Benzene + CO + HCl $\xrightarrow{\text{anhyd. AlCl}_3/\text{Cu}_2\text{Cl}_2}$ benzaldehyde
(iii) Cyclohexene $\xrightarrow{\text{O}_3 \text{ then Zn-H}_2\text{O}}$ hexane-1,6-dial
(iv) Phenol + CCl$_4$ $\xrightarrow{\text{OH}^- \text{ then H}^+}$ salicylic acid