Which isomer of $\mathrm{C}_4 \mathrm{H}_9 \mathrm{OH}$ has highest boiling point?

Identify the product ' B ' in the following series of reactions.

$$\text { Propan -1-ol } \xrightarrow[623 \mathrm{~K}]{\mathrm{A}_2 \mathrm{O}_3} \mathrm{~A} \xrightarrow[\text { i) } \mathrm{H}_2 \mathrm{O}]{\text { i) } \mathrm{Conch}_2 \mathrm{SO}_4} \mathrm{~B}$$

Which of the following is a tertiary allylic alcohol?

Which from following is NOT a dihydric compound?