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Indian Forest Service (Mains)

Chemistry optional

  • 2 papers
  • 200 marks each
  • 3 h per paper

Paper II covers organic chemistry and spectroscopy.

Indian Forest Service (Mains), Chemistry optional · 2024 · Paper II

Q2(b)(i). Photolysis of an ortho-methyl diazo compound

Question

Identify A and B from irradiation of the drawn o-methylphenyldiazomethane. [structure given in the paper]

Answer in brief

A is o-methylphenylcarbene after nitrogen loss; intramolecular C–H insertion gives benzocyclobutene B.

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The full model answer

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Topic notes: reactive intermediates (carbocations, carbanions, radicals, carbenes, nitrenes, benzyne), with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverscarbene C–H insertiondiazo photolysisbenzocyclobuteneo-methylphenylcarbenereactive intermediates

All parts of Question 2