1. Tardigrade
  2. Question
  3. Chemistry
  4. Which of the following alkynes is most acidic?

Q. Which of the following alkynes is most acidic?

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Solution:

But-2-yne has no hydrogen attached to sp hybridised carbon. So all other compounds are more acidic than it. But-1-yne and Propyne have groups having + I effect attached to triple bond. As the number of groups which gives +I effect increases, acidic character decreases.
gives effect
Thus, ethyne is most acidic of all four compounds.