Oxygen sp hybridization
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Oxygen is sp hybridised due to 2 reasons and not sp2 hybridised.It uses one p orbital (px) for forming a sigma (single) bond with carbon and one p (py) orbital for forming a parallel overlapping bond called pi bond.Here one electron from the pz orbital jumps in the lower py orbital to form a stable bond (less energy..more stability).The diagrammatic representation will help more-
Triple bond is present between C and O, where partial negative charge (extra pair of electrons) is on the O atom and partial positive charge on the C atom. The compound since has triple bond, we may conclude it as sp hybridisation. For better understanding, see its structural formula. 11.6K views