Select the catalyst used in the hydrogenation of ethene.

$KO_2C-CH_2-CH_2-CO_2K \xrightarrow{\text{electrolysis}} (A) \text{ (major)}$ (Kolbe electrolysis method). The product $(A)$ of the reaction is:

Cyclohexene on oxidation with $KMnO_4$ in dil. $H_2SO_4$ forms.

Draw the $cis$ and $trans$ structures of $hex-2-ene$. Which isomer will have a higher $b.p.$ and why?

Propene when heated with chlorine at about $500 \, ^oC$ forms

The major product of the following reaction is $-$