To make us understand certain phenomenon like the higher acidity of alkynes than alkanes and alkenes, our teacher told us to learn this as a general rule:
Higher s character leads to a more electronegative carbon atom.
Note: By s character I mean the percentage of s in the hybridisation of the carbon atom (e.g., 25% s character in spX3 hybrid carbon)
Though this well explains the above mentioned phenomenon (and certain others like the decreased C−Cl bond length in chlorobenzene), but I was unable to figure out the reason for this increased electronegativity.
This did not provide me a satisfactory answer. Electronegativity is after all the ability of an atom to attract the shared pair of electrons towards itself. So, how would one explain this using the concept of orbitals or molecular orbital theory?
I would also like to know if the same argument is valid for other p-block elements?
