Molecular Geometry — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Molecular Geometry.

Identification of molecular geometry for complex ions/molecules with expanded octets.

high

NEET frequently tests the ability to apply VSEPR to species beyond simple octet rule compounds. Questions involving noble gas compounds (like $ ext{XeF}_2$, $ ext{XeF}_4$, $ ext{XeO}_3$) or interhalogen compounds (like $ ext{ClF}_3$, $ ext{BrF}_5$, $ ext{ICl}_4^-$) are common. These require careful calculation of lone pairs and understanding of geometries for steric numbers 5 and 6, where lone pair placement is crucial (e.g., equatorial for trigonal bipyramidal, trans for octahedral).

Comparison of bond angles in a series of related molecules.

high

This is a classic NEET question type. Students are often asked to arrange molecules in increasing/decreasing order of bond angles (e.g., $ ext{H}_2 ext{O}$, $ ext{NH}_3$, $ ext{CH}_4$) or identify the molecule with the smallest/largest bond angle. This tests the understanding of how lone pair repulsion and electronegativity differences influence bond angle distortions from ideal VSEPR values. A nuanced understanding of LP-LP > LP-BP > BP-BP repulsion is key.

Correlation between molecular geometry and molecular polarity.

medium

While direct geometry identification is common, linking geometry to polarity adds another layer of conceptual understanding. Questions asking 'Which of the following is polar/non-polar?' require students to first determine the geometry and then assess if the bond dipoles cancel due to symmetry. Molecules like $ ext{CCl}_4$, $ ext{BF}_3$, $ ext{CO}_2$ (non-polar despite polar bonds) versus $ ext{SO}_2$, $ ext{NH}_3$, $ ext{H}_2 ext{O}$ (polar) are frequently used examples.