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

  • question_answer
    But-1-yne is weakly acidic but but-2-yne is not. Assign reason.

    Answer:

                    But-1-yne \[(C{{H}_{3}}-C{{H}_{2}}-C\equiv C-H)\]  is a terminal alkyne and the triple bonded carbon has a hydrogen atom attached to it which can be removed as a \[{{H}^{+}}\] by suitable reaction. On the other hand, but-2-yne \[(C{{H}_{3}}-C\equiv C-C{{H}_{3}})\]  is a non-terminal alkyne and the triple bonded carbon has no hydrogen atom attached to it. Therefore, it cannot behave as an acid.


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