Which of the following compounds is formed when ether is dissolved in cold concentrated sulphuric acid?

Identify the product ' B ' in the following reaction.

$$ \text { Sodium phenoxide } \xrightarrow[6 \,atm]{\mathrm{CO}_2, 398 \mathrm{~K}} \mathrm{~A} \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}} \mathrm{B} $$

Which of the following forms 2-Methylbut-2-ene on heating with concentrated sulphuric acid?

Which of the following compounds has lowest solubility in water?