The angle of the C-0-C bond in ether is found to be 11 1± 4^0.The oxygen atom uses its four sp^3 hybrid orbitals[each one of two contains one unpaired electron and each one of the other two contains one lone pair of electrons] to overlap two half filled sp^3 orbitals of the two carbon atoms of the alkyl groups of ether. The two lone pairs of electrons occupying the two hybrid orbitals of oxygen are available for hydrogen bond formation with silanol groups.