Catalytic dehydrogenation of a primary alcohol gives a

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

Compare the rate of dehydration of $(i)$,$(ii)$ and $(iii)$ by conc. $H_2SO_4$.

When benzyl alcohol is oxidised with $KMnO_4$,the product obtained is

Primary and secondary alcohols on action of reduced copper give

Compare the water solubility (miscibility) of ethers and alcohols.