Identify the product $A$ formed when the following compound is treated with $KMnO_4 / H^+$.

Which of the following compounds is formed as the major product in the following reaction?
$2-\text{methylbut-}2-\text{ene} \xrightarrow[\text{Peroxide}]{HBr} \text{Product}$

$A$ compound $A$ on reaction with $X$ and $Y$ produces the same major product but different by-products $a$ and $b$. Oxidation of $a$ gives a substance produced by ants.
$X$ and $Y$ respectively are :

The major product of the following reaction is

$\underset{C_7H_{14}}{(A)} \xrightarrow[Zn/AcOH]{O_3} (B) + (C)$
Compound $(A)$ exists as geometrical isomers and $(B)$ gives the Cannizzaro reaction. $(A)$ will be:

But$-2-$ene on reaction with alkaline $KMnO_4$ at elevated temperature followed by acidification will give: