• # question_answer Order of reactivity of ${{C}_{2}}{{H}_{6}},{{C}_{2}}{{H}_{4}}$ and ${{C}_{2}}{{H}_{2}}$ is [MH CET 2004] A) ${{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{4}}>{{C}_{2}}{{H}_{2}}$ B) ${{C}_{2}}{{H}_{2}}>{{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{4}}$ C) ${{C}_{2}}{{H}_{2}}>{{C}_{2}}{{H}_{4}}>{{C}_{2}}{{H}_{6}}$ D) All are equally reactive

Unsaturated hydrocarbons are more reactive than saturated hydrocarbons. Among ethyne $({{C}_{2}}{{H}_{2}})$ and ethene $({{C}_{2}}{{H}_{4}})$ the later is more reactive as $C\equiv C$ triple bond is quite strong bond and therefore ethyne generally require catalysts (like $H{{g}^{2+}}$ etc) in its reactions.