The formation of isopropyl chloride from the reaction between propene and $HCl$ is based on which of the following?

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

The major product of the following reaction is:

$R_f$ value for $2$-methylpropene in a solvent system (Ethyl acetate + ether) is $0.42$. $2$-methylpropene is treated with dilute $H_2SO_4$ to give major organic product $(X)$. $R_f$ value for $(X)$ in the same solvent system under identical condition will be:

Which of the following compounds forms $1-$bromo$-1-$methylcyclohexane when treated with $HBr$?

What is obtained when a mixture of ethylene,carbon monoxide,and water is heated at high temperature?