Propene can be converted into propan-1-ol by.....

1. Hydration.
2. Hydroboration - oxidation.
3. Reaction with alkaline KMnO_4.
4. Reaction with dil.NaOH solution.

Dear Student,

Let's write the reaction scheme for conversion of propene to propan-1-ol as expressed below,

$$\begin{gathered} C{H}_3-CH=C{H}_2 \stackrel{HBr/Peroxide}{\to } C{H}_3-C{H}_2-C{H}_2-Br \stackrel{Aq.KOH/∆}{\to } C{H}_3-C{H}_2-C{H}_2-OH \\ Propene 1-Bromopropane Propan-1-ol \end{gathered}$$

Hence the answer is Option (2) Hydroboration-Oxidation

​Regards.