Alkynes

Mediumchemistry

The acidity of alkynes is due to:

sp³ hybridization

sp² hybridization

sp hybridization

No hybridization

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Correct Answer:

sp hybridization

Terminal Alkynes ( $R - C \equiv C - H$ ) exhibit weak acidic character.

This is due to the $s p$ hybridization of the carbon atoms in the triple bond.
An $s p$ orbital has 50% $s$ -character, making it more electronegative than $s p^{2}$ or $s p^{3}$ orbitals.
The $s p$ carbon pulls the shared electron pair of the $C - H$ bond closer to itself, making the $H$ atom more easily removable as a proton ( $H^{+}$ ) by a strong base (like $N a N H_{2}$ ).

This medium difficulty chemistry question is from the chapter hydrocarbons, covering the topic of alkynes. It appeared in the 2025 exam.

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