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

$O_3$ reacts with $CH_2 = CH_2$ to form an ozonide. On hydrolysis,it forms:

Which of the following reactions results in the formation of a pair of diastereomers?

The number of alkene$(s)$ which can produce $2-butanol$ by the successive treatment of $(i)$ $B_{2}H_{6}$ in tetrahydrofuran solvent and $(ii)$ alkaline $H_{2}O_{2}$ solution is:

Identify the wrong statement for the following reactions:
$CH_3-CH(CH_3)-CH=CH_2 \xrightarrow{HBr} A$
$CH_3-CH(CH_3)-CH=CH_2 \xrightarrow{HBr + ROOR} B$
$CH_3-CH(CH_3)-CH=CH_2 \xrightarrow{NBS} C$

Identify the reagent$(s)$ $A$ and condition$(s)$ for the reaction shown in the image: