In the reaction,$H_2C = CH_2 \xrightarrow{\text{cold alkaline } KMnO_4} (A)$. Product $A$ is :

The correct order of the addition reaction rates of halogen acids with ethylene is

What is meant by hydroboration-oxidation reaction? Illustrate it with an example.

$A$ dibromide $X$ $(C_4H_8Br_2)$ on dehydrohalogenation gave $Y$,which on reduction with $Z$ gave a non-polar isomer of $C_4H_8$. What are $X$ and $Z$ respectively?

What is the number of $\sigma$ bonds in $1$-butene?

$But-1-ene$ may be converted to $butane$ by reaction with: