It is very difficult to deprotonate a hydrogen that is attached to an alkyne carbon as the pi bonds sterically block the base from extracting the hydrogen.

Question

Quizplus · Accepted Answer

Alkyne hydrogens (attached to the triple-bonded carbon) are relatively acidic compared to other hydrocarbons because the resulting anion is stabilized by the sp-hybridized carbon, not because of steric hindrance from pi bonds.

It Is Very Difficult to Deprotonate a Hydrogen That Is