The structure of borazine, B3N3H6, is a six-membered ring of alternating B and N atoms. There is one H atom bonded to each B and to each N atom. The molecule is planar.
The six B-N bonds in the borazine molecule are all identical in length at 1.44 Å . Typical values for the bond lengths of B-N single and double bonds are 1.51 Å and 1.31 Å respectively. Does the value of the B-N bond length seem to favor one Lewis structure over the other?