The boiling points of the following comounds

I. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COOH}$
II. ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{NH}}_2$
III. ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{OH}$ IV. ${\mathrm{CH}}_3{\mathrm{CH}}_2\equiv \mathrm{CH}$

decrease in the order :

Which of the following,

$\text{(i) }\mathrm{R}-\mathrm{CO}-\mathrm{CO}-\mathrm{R}$

$\text{(ii) }\mathrm{R}-\mathrm{CO}-\mathrm{CHOH}-\mathrm{R}$

$\text{(iii) }\mathrm{R}-\mathrm{CHOH}-{\mathrm{CH}}_2-\mathrm{CHOH}-\mathrm{R}$

$\text{(iv) }\mathrm{R}-\mathrm{CHOH}-\mathrm{CHOH}-\mathrm{R}$

Will be oxidised by ${\mathrm{HIO}}_4$?

Following equation illustrates:

Identify the product in the following reaction.

$\mathrm{A}$ and $\mathrm{B}$ are respectively: