Aldehydes and Ketones — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Aldehydes and Ketones.

Multi-step synthesis involving protection/deprotection of carbonyl groups.

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NEET is increasingly moving towards integrated questions that test multiple concepts. Protection of carbonyl groups (e.g., using ethylene glycol to form acetals/ketals) is a crucial strategy in multi-step synthesis to prevent unwanted reactions. A question might involve protecting a ketone, carrying out a reaction on another functional group, and then deprotecting the ketone. This tests understanding of both carbonyl chemistry and synthetic strategy, making it a good candidate for a challenging question.

Stereochemical outcomes of nucleophilic addition reactions.

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When a nucleophile adds to a planar carbonyl carbon, a new chiral center can be formed. If the starting material is achiral, a racemic mixture of enantiomers is typically formed. Questions might ask about the stereochemistry of the product, especially for reactions like HCN addition to an unsymmetrical aldehyde or ketone. This tests the understanding of stereochemistry in conjunction with reaction mechanisms, which is a common advanced topic in NEET.

Application of DIBAL-H for selective reduction of nitriles/esters to aldehydes.

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DIBAL-H (Diisobutylaluminium hydride) is a highly selective reducing agent that can reduce nitriles and esters to aldehydes under controlled conditions (low temperature). This is a specific and important preparation method for aldehydes that often gets overlooked compared to more common methods. Questions testing the selective reduction capabilities of DIBAL-H, especially in contrast to stronger reducing agents like $LiAlH_4$, are highly probable as they assess nuanced understanding of reagents.