Question

Why are alkynes acidic in nature?

Answer 1

The acidity of a terminal alkyne is due to the high level of s character in the sp hybrid orbital, which bonds with the s orbital of the hydrogen atom to form a single covalent bond. The high level of s character in an sp‐hybridized carbon causes the overlap region of the σ bond to shift much closer to the carbon atom.

Answer 2

Acidic nature of terminal alkynes are due to greater s character in carbon hybrid orbitals.
we khnow that s electrons are closer to nucleus than p electrons, therefore,
the more s character in a hybrid atomic orbital, closer will be electrons of the bond towards nucleus.