Carbon exists in the atmosphere in the form of

Which of the following statements are usually correct for carbon compounds? These

(i) are good conductors of electricity.

(ii) are poor conductors of electricity.

(iii) have strong forces of attraction between their molecules.

(iv) do not have strong forces of attraction between their molecules.

${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{OH}\stackrel{\mathrm{Alkaline} {\mathrm{KMnO}}_4+\mathrm{Heat}}{\to }{\mathrm{CH}}_3-\mathrm{COOH}$

In the above given reaction, alkaline ${\mathrm{KMnO}}_4$ acts as