Which of the following can be used to test the acidic nature of ethanol?

The sum of the number of $\alpha$-hydrogen atoms present in compounds $A$ and $B$ is:

In the following sequence of reactions,the product $C$ is: $CH_3-CH_2-CH_2-Br$ $\xrightarrow{KOH(alc)} (A)$ $\xrightarrow{HBr} (B)$ $\xrightarrow{KOH(aq.)} (C)$

Which of the following are not cleaved by $HIO_4$?
$I :$ glycerol
$II :$ glycol
$III :$ $1,3-$propanediol
$IV :$ methoxy$-2-$propanol

Which of the following alcohols has the lowest boiling point?

$CH_3-CH_2-CH_2-Br + NaOH \xrightarrow{C_2H_5OH} \text{Product } A$. Consider the above reactions,identify product $B$ and product $C$.