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What is the geometry of the oxygen in CH3OCH3?
The electronic geometry around is oxygen in ##H_3C-O-CH_3## is ##"TETRAHEDRAL"## to a first approximation.........
Why? Well, there are ##2xxO-C## bonds, and 2 oxygen-centred lone pairs of electrons. The most stable geometry for the electron pairs, bonding and non-bonding is a tetrahedron, a prediction of ##"VSEPR"##. Because the oxygen-centred lone pairs are close to the oxygen (and not bound to a neighbouring atom), these tend to compress the ##/_C-O-C## bond angle to give a value of ##105^@## rather than ##109.5^@##.
But we describe molecular geometry on the basis of bound atoms, not lone pairs. ##"Dimethyl ether"## is bent around oxygen, a precise analogue of water. Agree? What about ##H_3C-S-CH_3##?
