Intermolecular Forces — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Intermolecular Forces.

Comparative Boiling Points with Isomers

high

NEET frequently tests the impact of molecular shape on London Dispersion Forces. Questions comparing the boiling points of structural isomers (e.g., n-pentane, isopentane, neopentane) are highly probable. Students need to understand that increased branching leads to a more spherical shape, reducing surface area for contact and thus weakening LDFs, resulting in lower boiling points. This tests a nuanced understanding of LDFs beyond just molar mass.

Solubility in Different Solvents

medium

The 'like dissolves like' principle is a direct application of IMFs. Questions asking to predict the solubility of a given solute in different solvents (e.g., 'Which of the following will be most soluble in water?' or 'Why is iodine more soluble in $CCl_4$ than in water?') are likely. This requires identifying the dominant IMFs in both solute and solvent and determining if favorable interactions can occur.

Impact of Hydrogen Bonding on Biological Molecules

low

While the core topic is physical chemistry, NEET often integrates concepts across subjects. A question might touch upon the role of hydrogen bonding in the stability of DNA double helix or protein secondary structures. This would be a slightly more advanced application, testing if students can extend their understanding of IMFs beyond simple inorganic or small organic molecules to biological contexts. It's less frequent but a good test of comprehensive understanding.