The major product of the reaction of $2$-butene with alkaline $KMnO_4$ solution is

Which among the following alkenes is most stable?

Isobutene in the presence of dilute $H_2SO_4$ forms an alcohol. The major product is

$Isobutene + HBr \xrightarrow{\text{Peroxide}} \text{Product}$ is:

Indirect hydration of an alkene cannot produce only one alcohol. This alcohol is $......$.

$A$ hydrocarbon $X$ adds one mole of hydrogen to give another hydrocarbon and decolourises bromine water. $X$ reacts with $KMnO_4$ in the presence of acid to give two moles of the same carboxylic acid. The structure of $X$ is: