What is the product obtained when ethanol vapor is passed over $Al_2O_3$ at $240 - 250 \, ^\circ C$?

Which of the following has the lowest boiling point?

The product of the reaction $CH_3O-CH_2-CH(OCH_3)-CH_2-OCH_3 \xrightarrow{HI(excess)}$ is:

Ethoxybenzene on reaction with hot and concentrated $HI$ forms:

Explain: In alkoxybenzene,the alkoxy group is ortho-para directing,but why does electrophilic substitution occur mainly at the para-position and to a lesser extent at the ortho-position?

Allyl phenyl ether can be prepared by heating: