Glycol on treatment with $PI_3$ mainly gives -

The product of the following reaction is:
$CH_3CH_2CH_2CH=CH_2 \xrightarrow[(ii) H_2O_2, OH^-]{(i) BH_3/THF} \text{Product}$

Oxymercuration-demercuration of allylbenzene $(C_6H_5CH_2CH=CH_2)$ produces:

For which of the following reactions is Markovnikov's rule most applicable?

$CH_2=CH_2 \xrightarrow{Br_2/H_2O} A$. In the above reaction,the compound $A$ is:

Which products are obtained on reaction of but$-1-$ene with $HBr$ in the presence of peroxide?