Ether on carbonylation gives:

The $C - O - C$ bond angle in ethers is approximately -

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?

The products formed when diethyl ether is reacted with cold $HI$ are

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 of the following is true for Williamson's synthesis?