### GROUP 13 — BORON FAMILY
| Compound | Formula | Key Fact |
|---|---|---|
| Diborane | $B_{2}H_{6}$ | 3c-2e banana bonds; 2 bridging + 4 terminal H |
| Borax | $Na_{2}B_{4}O_{7}$·\$10H_{2}O$ | 2 $BO_{3}$ + 2 $BO_{4}$ units; borax bead test |
| Boric acid | $H_{3}$$BO_{3}$ | Lewis acid; accepts $OH^{-}$; monobasic; layered H-bond structure |
| Aluminium chloride | $Al_{2}Cl_{6}$ | Dimer; Lewis acid; Friedel-Crafts catalyst |
| Inert pair effect | Tl shows +1 | $ns^{2}$ pair becomes inert going down group |$
Part of INC-02 — p-Block Elements: Groups 13-15
INC-02 Final Revision Cheat Sheet
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