# Carbon dioxide electronic geometry [duplicate]

It is known that allene (propadiene) $$\ce{H2C=C=CH2}$$ geometry is such that its hydrogen atoms are not in the same plane – do not form rectangle, but “extended tetrahedron”

I wonder if structurally analogous carbon dioxide $$\ce{O=C=O}$$ exhibit similar geometry, i.e. do its lone electron pair orbitals form extended tetrahedron as well (IUPAC officers probably would not like following structure diagram)

or are they in the same plane? And why?

• AFAIK, neither. Oxygens are probably sp hybridised - this stuff with el. pairs is tricky. – Mithoron Dec 31 '19 at 19:49
• @Mithoron Well, what's then your proposal of its Lewis formula? I bet they are sp² hybridized, like in oxo group in organics. – mykhal Dec 31 '19 at 20:02
• It has nothing to do with Lewis formula. You assume lone pairs have to be identical, but it's not true. Martin could elaborate more about this stuff. – Mithoron Dec 31 '19 at 20:10
• chemistry.stackexchange.com/questions/50906/… – Mithoron Dec 31 '19 at 20:19
• – Mithoron Dec 31 '19 at 20:26