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Among the following inorganic ring systems, identify the aromatic species (one that satisfies Huckel's 4n+2 rule with a planar, fully conjugated cyclic pi system):

1. Borazine: planar six-membered B3N3H6 ring (inorganic benzene)
2. Six-membered ring containing an Si-H unit
3. Seven-membered ring containing a B-H unit
4. Fused bicyclic boron ring system that is non-planar

Correct answer: Borazine: planar six-membered B3N3H6 ring (inorganic benzene)

Solution

Borazine (B3N3H6), often called inorganic benzene, is a planar six-membered ring in which each nitrogen lone pair is donated into the ring, generating a delocalised six pi-electron system (4n+2, n=1). This makes it aromatic. The silicon-containing and seven-membered B-H rings, and the non-planar fused boron system, do not meet the planarity plus 4n+2 requirement.

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