Propene on treatment with $HBr$ gives

In the given reaction sequence,$Y$ is:
Cyclohexanol $\xrightarrow{H^{\oplus}/\Delta} X$ $\xrightarrow[(2) H_2O/Zn]{(1) O_3} Y$

What product is formed when the alkene $R-CH=CH_2$ reacts with $B_2H_6$ in the presence of $H_2O_2$?

Which compound would give $5-$keto$-2-$methylhexanal upon ozonolysis?

The reaction of ethene with $Cl_2$ in a saturated solution of $KBr$ yields:

Which of the following alkenes,on reaction with dil. $H_2SO_4$,does not produce the following alcohol?