In the following reaction,the major products are

In which of the following reactions is the product obtained $t-$butyl methyl ether?

Give the common and $\rm {IUPAC}$ names for the following ether compounds:
$(i) \ CH_3OCH_3$
$(ii) \ C_2H_5OC_2H_5$
$(iii) \ C_6H_5OC_6H_5$
$(iv) \ CH_3OCH_2CH_2CH_3$
$(v) \ CH_3OCH(CH_3)_2$
$(vi) \ C_6H_5OCH_3$
$(vii) \ C_6H_5OCH_2CH_3$
$(viii) \ C_6H_5O(CH_2)_6CH_3$
$(ix) \ C_6H_5OCH_2CH_2CH(CH_3)_2$
$(x) \ CH_3OCH_2CH_2OCH_3$
$(xi) \ C_2H_5OCH_2CH_2OC_2H_5$
$(xii) \ CH_3OCH_2CH_2CH_2OCH_3$
$(xiii) \ CH_3OCH_2CH_2OC_2H_5$
$(xiv) \ \text{Cyclohexyl methyl ether}$

Ethers are prepared from alcohols by Williamson synthesis. Heating ethanol with sulfuric acid at $413 \ K$ gives ethoxyethane. Match the ether compounds in Column-$I$ with the products formed upon heating with $HI$ in Column-$II$.

Column-$I$ (Ether)	Column-$II$ (Product)
$(A)$ $CH_3CH_2-CH(CH_3)-CH_2-OCH_2CH_3$	$(i)$ $CH_3OH + CH_3-C(CH_3)_2-I$
$(B)$ $CH_3CH_2CH_2-O-C(CH_3)_2CH_2CH_3$	(ii) $C_6H_5OH + C_6H_5CH_2I$
$(C)$ $C_6H_5CH_2-O-C_6H_5$	(iii) $CH_3CH_2CH_2OH + CH_3CH_2-C(CH_3)_2-I$
$(D)$ $CH_3-C(CH_3)_2-O-CH_3$	(iv) $CH_3CH_2-CH(CH_3)-CH_2OH + CH_3CH_2I$

Why is the $C-O-H$ bond angle in alcohol slightly less than the tetrahedral angle,whereas the $C-O-C$ bond angle in ether is slightly greater?

Which of the following compounds has no reaction with sodium metal?