The reaction of isobutene with $HBr$ yields:

The reaction of propene with $H_3O^{+}$ proceeds through which of the following intermediates?

$CH_3-CH=CH_2$ $\xrightarrow[reagent]{\text{Bayer's}} X$ $\xrightarrow{HIO_4} \text{product},$
Product is

In which of the following,addition of $HBr$ does not take place against Markownikoff's rule,or for which is the Anti-Markownikoff addition of $HBr$ not observed?

The major products $P$ and $Q$ from the below reactions are :
$CH_3CH=CH_2 \xrightarrow{HBr} P$
$CH_3CH=CH_2 \xrightarrow[(BH_3)_2]{H_2O, H_2O_2 / OH^-} Q$

In the reaction sequence $CH_3CH = CHCH_3$ $\xrightarrow{O_3} A$ $\xrightarrow{H_2O/Zn} B$,the alkene forms product $B$. What is product $B$?