Acetic acid, bond angles dimer

Acetanilide, electrophilic aromatic substitution of, 939-940 Acetate ion, bond lengths in, 43 electrostatic potential map of, 43, 53, 56, 757 resonance in, 43 Acetk acid, bond angles in, 755 bond lengths in, 755 dimer of, 755 dipole moment of, 39 electrostatic potential map of, 53, 55... 

One after the other, examine methanol dimer and acetic acid dimer. Do the hydrogen-bond lengths in these systems differ significantly from the optimum distance in water dimer Are the hydrogen-bond angles in these compounds significantly different from those in water dimer Rationalize your results. 

The bond lengths and bond angles for the molecules, methanol, acetic acid, and formic acid are given in Table III. The methanol geometry was taken from microwave spectroscopy [17], while the formic and acetic acid geometries were taken to be those of the dimers, found by gas phase electron diffraction [14-15, 13]. X-ray structural parameters were used for crystal packing studies of formic acid [32] and neutron diffraction data for acetic acid [33]. The hydrogen atoms for the molecules in their crystalline forms were positioned as described previously [46, 47]. 

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