The reaction of ethylene glycol with $PI_3$ gives:

$A$ better reagent to oxidize primary alcohols into aldehydes is

Among the compounds $A$ and $B$ with molecular formula $C_9H_{18}O_3$,$A$ has a higher boiling point than $B$. The possible structures of $A$ and $B$ are

Methyl alcohol can be distinguished from ethyl alcohol using

Which of the following reactions is not feasible?

Ethyl alcohol is heated with conc. $H_2SO_4$. The product formed is