The reaction of $1-$ethylcyclopentene with $BH_3 / THF$ followed by treatment with $H_2O_2 / NaOH$ produces:

The given reaction represents the ozonolysis of an alkene $A$. Identify $A$ and the product $B$ in the following reaction sequence:
$A + O_3$ $\rightarrow \text{ozonide intermediate}$ $\xrightarrow{Zn + H_2O} B + HCHO$

Identify $(Z)$ in the above sequence of reactions:
$CH_3-CH_2-CH=CH_2$ $\xrightarrow{HCl/\text{peroxide}} (A)$ $\xrightarrow{EtONa/\Delta} (Z) \text{ (major)}$

Bayer's reagent used to detect olefinic double bond is

Markownikoff's rule provides guidance for the addition of $HBr$ on:

Isobutene,in the presence of $H_2SO_4$,forms a mixture of two isomeric alkenes $(C_8H_{16})$. The major alkene is