Chapter 9, Problem 103AE

The structure of borazine, B₃N₃H₆, is a six-membered ring of altemating B and N atoms. There is one H atom bonded to each B and to each N atomThe molecule is planar.
a. Wrlte a Lewis structure for borazine in Which the formal charge on every atom is zero,
b. Write a Lewis structure for borazine in which the octet rule is satisfied for every atom.
c. What are the formal charges on the atoms in the Lewis structure from part (b)? Given the
electronegativites of B and N, do the formal charges seem favorable or unfavorable?
d. Do either of the Lewis structures in parts (a) and (b) have multiple resonance structures?
e. What are the hybridizations at the B and N atoms in the Lewis structures from parts (a) and (b)? Would you expect the molecule to be planar for both Lewis structures?
f. The six bonds in the borazine molecule are all identical in length at 1.44 A Typical values for the bond lengths Of single and double bonds are 1.51 and 1.31 A, respectively Does the value of the BiN bond length seem to favor one Lewis structure over the other?
g. How many electrons are in the r system of borazine?