Which of the following is obtained on oxidation of $prop-1-ene$ with acidic $KMnO_4$?

$CH_3-C(CH_3)(Br)-CH(CH_3)_2 \xrightarrow[\Delta]{EtOH} (A)$
Major product $(A)$ is

Addition of $HI$ on the double bond of propene yields isopropyl iodide and not $n$-propyl iodide as the major product. This is because the addition proceeds through

The alkene $R-CH=CH_2$ reacts readily with $B_2H_6$ and forms the product $B$,which on oxidation with alkaline hydrogen peroxide produces:

Provide the formula,structure,$IUPAC$ names,and common names of alkenes having carbon atoms $n = 1, 2, 3, 4$.

The organic compound $5-$allylcyclohex$-3-$ene$-1-$ol is reacted with cold,dilute,aqueous solution of $KMnO_4$. The total number of hydroxyl group$(s)$ $(-OH)$ present in the product is