11th Class Chemistry Hydrocarbons / हाइड्रोकार्बन Question Bank 11th CBSE Chemistry Hydrocarbons

  • question_answer
    How will you prepare (i) cis-pent-2-ene and trans-pent-2-ene by starting with ethyne?

    Answer:

                    \[\underset{\text{Ethyne}}{\mathop{HC\equiv CH}}\,\xrightarrow[196\,K]{Na,\,\,N{{H}_{3}}(l)}\,HC\equiv {{C}^{-}}\,N{{a}^{+}}\]\[\xrightarrow[-NaI]{C{{H}_{3}}I}\,\underset{\Pr \text{opyne}}{\mathop{C{{H}_{3}}-C\equiv CH}}\,\xrightarrow[196\,K]{Na,\,N{{H}_{3}}(l)}\,\underset{\text{Sod}\text{.}\,\,\text{propynide}}{\mathop{C{{H}_{3}}-C\equiv {{C}^{-}}N{{a}^{+}}}}\,\]


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