An acetylide anion is more stable than either a vinylic or alkyl anion due to Group of answer choices the greater stability of an sp hybrid orbital. the stabilization of the negative charge in orbitals with higher s character. the greater distance of the negative charge from the nucleus of the carbon atom. the larger number of π electrons.

the stabilization of the negative charge in orbitals with higher s character

Explanation:

Acetylide anion is a carbon anion compound or popularly called carbanion. Now Acetylide anion is sp hybridized. However acetylide anion tends to be more acidic as we move from sp³ to sp, hence acidicity increases, which makes sp to have the highest acidity and become the most  stable.

So, we can conclude that the acetylide anion is more acidic due to the stabilization of the negative charge in orbitals with higher s character and  as the s character increases, acidic nature of acetylide anion also increases.