The carbon bearing the lone pair in the anion shown has high s-character, which makes the anion far more stable than an alkyl carbanion. What are its hybridisation and percentage s-character?

Asp, 50%
Bsp2, 33%
Csp3, 25%
Dsp, 25%

Answer: A

The anion shown is the acetylide (ethynide) ion. The carbon is sp hybridised, with 50% s-character. The closer electrons are to the nucleus, the more stable the lone pair.

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