Propene on treatment with $HBr$ gives

How many propenyl radicals are possible from propene?

When $2-$Methylbut$-2-$ene is treated with hydrogen chloride,the major product obtained is

The intermediate during the addition of $HCl$ to propene in the presence of peroxide is

$A$ hydrocarbon $C_6H_{10}$ absorbs only one molecule of $H_2$ upon catalytic hydrogenation. Upon ozonolysis,it yields $CHO(CH_2)_4CHO$. What is the hydrocarbon?

The major product formed in the following reaction is: