Methods of Preparation — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Methods of Preparation.

Multi-step synthesis involving chain extension

high

NEET frequently tests the ability to connect multiple reactions. A common sequence involves starting with an alkyl halide, converting it to a Grignard reagent or a nitrile, and then forming a carboxylic acid. This tests knowledge of $S_N2$ reactions, Grignard formation, reaction with $CO_2$, and nitrile/Grignard hydrolysis, along with carbon chain extension. Students need to be proficient in identifying intermediates and final products across several steps.

Reagent specificity and selectivity

medium

Questions often focus on distinguishing between reagents that perform similar but not identical functions. For example, differentiating between PCC (alcohol to aldehyde) and $KMnO_4$ (alcohol to acid), or between Tollens' reagent (aldehyde to acid) and $KMnO_4$. Understanding which reagent is suitable for a specific transformation without affecting other functional groups present in a complex molecule is a key skill tested.

Conditions and byproducts of hydrolysis reactions

medium

The nuances of hydrolysis, particularly for nitriles and esters, are often overlooked. Questions might ask about the difference between acidic and basic hydrolysis (e.g., initial formation of carboxylate salt in basic hydrolysis) or the reversibility of acidic ester hydrolysis. Knowledge of byproducts (e.g., $NH_4^+$ from nitrile hydrolysis, $R'-OH$ from ester hydrolysis) can also be tested.