JEE Main & Advanced Chemistry Hydrocarbons Question Bank Aromatic Hydrocarbon

  • 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

    Correct Answer: C

    Solution :

    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.

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