Chloroethane reacts with $X$ to form diethyl ether. What is $X$?

An ether $(A)$,$C_5H_{12}O$,when heated with excess of hot concentrated $HI$ produced two alkyl halides which when treated with $NaOH$ yielded compounds $(B)$ and $(C)$. Oxidation of $(B)$ and $(C)$ gave a propanone and an ethanoic acid respectively. The $IUPAC$ name of the ether $(A)$ is

The ether $C_6H_5-O-CH_2-C_6H_5$ when treated with $HI$ produces:

Methoxyethane on reaction with hot concentrated $HI$ gives

The major product of the following reaction is:

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?