Which of the following reagents is used to convert propene to propan-$1$-ol?

The product of acid catalyzed hydration of $2-$phenylpropene is

What is the major product of the following reaction?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Cis form of alkene is found to be more polar than the trans form.
Reason $(R)$: Dipole moment of trans isomer of $2$-butene is zero.
In the light of the above statements,choose the correct answer from the options given below:

The product $(s)$ of the following reaction can best be described as

Addition of $HCl$ to vinyl chloride $(CH_2=CHCl)$ gives $1, 1-$dichloroethane $(CH_3-CHCl_2)$ because of: