Which of the following compounds resists the reaction with the nucleophilic hydroxide ion?

Explain the fact that in aryl alkyl ethers $(i)$ the alkoxy group activates the benzene ring towards electrophilic substitution and $(ii)$ it directs the incoming substituents to ortho and para positions in the benzene ring.

The following is not an appropriate reaction for the preparation of $t$-butyl ethyl ether:
$C_2H_5ONa + CH_3-C(CH_3)_2-Cl \to CH_3-C(CH_3)_2-O-C_2H_5$
$(i)$ What would be the major product of this reaction?
$(ii)$ Write a suitable reaction for the preparation of $t$-butyl ethyl ether.

Which product is obtained by the reaction of acetic anhydride with diethyl ether in the presence of anhydrous $AlCl_3$?

Ethyl chloride reacts with sodium ethoxide to form a compound $A$. Which of the following reactions also yields $A$?

Ether is formed when ethyl alcohol is heated with conc. $H_2SO_4$. The conditions are