Boron and its Compounds — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Boron and its Compounds.

Detailed mechanism of Lewis acidity of boric acid and its titration.

high

While the Lewis acidic nature of boric acid is well-known, NEET might delve deeper into the mechanism ($B(OH)_3 + H_2O \rightleftharpoons [B(OH)_4]^- + H^+$) and the role of polyhydroxy compounds (like glycerol) in enhancing its acidity for titration. Questions could involve identifying the correct reaction or explaining why a specific indicator works, or why it's titrated in presence of polyols. This tests a deeper understanding beyond just stating it's a Lewis acid.

Comparative properties of different allotropes of boron or boron nitrides.

medium

Boron exists in amorphous and crystalline forms, and boron nitride exists as h-BN (graphite-like) and c-BN (diamond-like). Questions could compare their physical properties (hardness, conductivity, lubrication) and uses, drawing parallels with carbon allotropes. This tests knowledge of structural variations and their impact on macroscopic properties, which is a common theme in p-block elements.

Reactions of diborane with various Lewis bases and higher boranes formation.

medium

Beyond the basic hydrolysis and reaction with ammonia, diborane reacts with various Lewis bases to form adducts, and with itself at higher temperatures to form higher boranes (e.g., $B_4H_{10}$, $B_5H_9$). Questions could present a reaction scheme involving diborane and ask for products or reaction conditions. This tests a more comprehensive understanding of diborane's reactivity beyond its structure.