INC-02: p-Block Groups 13–15 — 5-Bullet Rapid Revision — Summary

$B_{2}H_{6}$ has 3c-2e banana bonds (2 bridging H); $H_{3}BO_{3}$ is a monobasic Lewis acid (accepts $OH^{-}$ , not $H^{+}$ donor); $AlCl_{3}$ dimerises to $Al_{2}Cl_{6}$ as a Lewis acid Friedel-Crafts catalyst.
Haber: $N_{2}$ + $3H_{2}$ ⇌ $2NH_{3}$ with Fe catalyst at 450°C, 200 atm (compromise: low T → yield, high T → rate).
Ostwald: $NH_{3}$ → NO (Pt/Rh, 500°C) → $NO_{2}$ (no catalyst) → $HNO_{3}$ (absorption, NO recycled).
N-oxides: $N_{2}$ O and NO are neutral; $N_{2}$$O_{3}$ , $NO_{2}$ , $N_{2}$$O_{5}$ are acidic; only NO and $NO_{2}$ are paramagnetic.
P-oxoacid basicity = P-OH bonds only: $H_{3}PO_{2}$ (1 P-OH) = monobasic; $H_{3}P$$O_{3}$ (2 P-OH) = dibasic; $H_{3}P$$O_{4}$ (3 P-OH) = tribasic — P-H bonds never ionize.