Group 17 Elements — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Group 17 Elements.

Comparative properties and anomalies of Fluorine

high

The anomalous behavior of fluorine (electron gain enthalpy, bond dissociation enthalpy, acidic strength of HF) is a perennial favorite for NEET. Questions often involve comparing F with Cl or explaining why F deviates from group trends. This tests a deep understanding of atomic structure and bonding rather than just rote memorization. Expect MCQs asking to identify the incorrect statement about fluorine's properties or to explain a specific anomaly.

Reactions and oxidizing power of Halogens

high

The reactivity of halogens with hydrogen, water, and other halogens, along with their relative oxidizing power, is fundamental. Questions frequently ask to predict the feasibility of a reaction (e.g., $Cl_2 + 2KBr$) or to identify the products. This tests the student's ability to apply the trend of decreasing oxidizing power down the group. Understanding the specific reaction of fluorine with water is also a common point of inquiry.

Structures and properties of Interhalogen Compounds and Oxoacids

medium

VSEPR theory application to interhalogen compounds ($XX_3'$, $XX_5'$, $XX_7'$) and understanding the trend in acidic strength of oxoacids (e.g., $HClO_x$ series) are important. Questions might ask for the geometry of a specific interhalogen compound or the correct order of acidic strength for a series of oxoacids. This requires both knowledge of VSEPR and the factors influencing acid strength.

Industrial Preparation Methods

low

While less frequent than conceptual questions, specific industrial preparation methods like Deacon's process for chlorine or the electrolytic method for $Cl_2$ and $NaOH$ can appear. These are usually direct recall questions. Students should know the reactants, conditions, and main products for these key industrial processes.