The bond angle of $C-O-C$ bond in methoxy methane is (in $^{\circ}$)

$Ph-O-CH_2-Ph$ $\xrightarrow{HI/\Delta}$ product

The major product of the following reaction sequence is:

When is methyl tert-butyl ether formed?

Predict the products of the following reactions:
$(i)$ $CH_3-CH_2-CH_2-O-CH_3 + HBr \rightarrow$
$(ii)$ $\text{Ethoxybenzene} + HBr \rightarrow$
$(iii)$ $\text{Ethoxybenzene} \xrightarrow{\text{Conc. } H_2SO_4 / \text{Conc. } HNO_3}$
$(iv)$ $(CH_3)_3C-O-C_2H_5 \xrightarrow{HI}$

What product is formed when anisole reacts with concentrated $HNO_3$ and concentrated $H_2SO_4$?