Borazine () is known as inorganic benzene. In its highly delocalized planar ring, how many coordinate (dative ) back bonds are theoretically contributed from Nitrogen to Boron to complete the sextet o

Question

Borazine ($B_3N_3H_6$) is known as inorganic benzene. In its highly delocalized planar ring, how many coordinate (dative $\pi$) back bonds are theoretically contributed from Nitrogen to Boron to complete the sextet of Boron?

Prashant Kotian · Accepted Answer

Correct answer: 3. The core ring is an alternating hexagon. Each of the 3 Nitrogen atoms contributes its localized lone pair into the empty orbitals of the 3 adjacent Boron atoms via dative back bonding. This creates 3 double-bond equivalents that resonate around the ring.

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