GATE Organic Chemistry: Pericyclic Reactions and Photochemistry: Electrocyclic, cycloaddition and sigmatropic reactions. Diels-Alder reaction, Claisen and Cope rearrangements and their applications in organic synthesis. FMO method of analysis. Woodward-Hoffmann rules. Photochemistry of alkenes, arenes and carbonyl compounds. Photo-oxidation and photo-reduction. Di-π-methane rearrangements, Norrish type-I and II reactions. Paternό-Büchi reaction, Photo- Curtius and Wolff rearrangements. Barton and Hofmann-Lӧffler-Freytag reactions. – Previous Year Questions

6 GATE previous year questions on Pericyclic Reactions and Photochemistry: Electrocyclic, cycloaddition and sigmatropic reactions. Diels-Alder reaction, Claisen and Cope rearrangements and their applications in organic synthesis. FMO method of analysis. Woodward-Hoffmann rules. Photochemistry of alkenes, arenes and carbonyl compounds. Photo-oxidation and photo-reduction. Di-π-methane rearrangements, Norrish type-I and II reactions. Paternό-Büchi reaction, Photo- Curtius and Wolff rearrangements. Barton and Hofmann-Lӧffler-Freytag reactions. (Organic Chemistry, Chemistry) with answers and explanations, from every paper.

1. GATE 2026 CY Q38 (2 marks, Multiple choice) – The correct statement about the intermediate formed in the following reaction is
2. GATE 2026 CY Q49 (2 marks, Multiple select) – The reaction(s) that produce(s) the following compound is(are)
3. GATE 2026 CY Q58 (2 marks, Numerical answer) – On heating, the compound Z undergoes a series of 1,5-H/D shifts to give a mixture of its isomers. The total number of isomers present in the mixture…
4. GATE 2025 CY Q27 (1 mark, Multiple select) – Choose the correct option(s) with regard to mechanism of the following transformation.
5. GATE 2024 CY Q14 (1 mark, Multiple choice) – The major product in the following reaction sequence is
6. GATE 2024 CY Q54 (2 marks, Multiple select) – Consider the following reaction sequence where M and N are the major products. The correct option(s) is (are)