JEE Main & Advanced Chemistry Hydrocarbons / हाइड्रोकार्बन Question Bank Alkyne

  • question_answer
    When propyne reacts with aqueous \[{{H}_{2}}S{{O}_{4}}\] in the presence of \[{{C}_{2}}{{H}_{4}}\], the major product is [IIT-JEE 1983; AFMC 1991; KCET 1993]

    A) Propanal

    B) Propyl hydrogen sulphate

    C) Acetone

    D) Propanol

    Correct Answer: C

    Solution :

               \[C{{H}_{3}}-C\equiv CH+{{H}_{2}}O\underset{1%\text{ }HgS{{O}_{4}}}{\mathop{\xrightarrow{40%\,{{H}_{2}}S{{O}_{4}}}}}\,\]                    \[C{{H}_{3}}-\underset{OH\,\,}{\mathop{\underset{|\,\,\,}{\mathop{C\,\,}}\,=}}\,\,\,C{{H}_{2}}\xrightarrow{\text{Rearrangem ent}}\underset{\text{Acetone}}{\mathop{C{{H}_{3}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}}}\,\]


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