What is produced when glycerol is heated with oxalic acid at $110\,^{\circ}C$?

$C_2H_5OH$ can be differentiated from $CH_3OH$ by:

An alcohol $X$ $(C_4H_{10}O)$ does not give turbidity with conc. $HCl$ and $ZnCl_2$ at room temperature. $X$ on reaction with reagent $Y$ gives $Z$. What are $X, Y$ and $Z$ respectively?

Consider the following reaction sequence: $CH_3CHO$ $\xrightarrow[(ii) H_2O/H^+]{(i) CH_3MgBr} (A)$ $\xrightarrow{H_2SO_4, \Delta} (B)$ $\xrightarrow[(ii) H_2O_2/OH^-]{(i) B_2H_6} (C)$. $(A)$ and $(C)$ are

$CH_3 CH_2 OH$ $\xrightarrow{Cl_2} CH_3 CHO$ $\xrightarrow{3 Cl_2} Cl_3 CCHO$. In the above reactions,the role of $Cl_2$ in step-$1$ and step-$2$ respectively is:

Isopropyl alcohol on oxidation forms