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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 · 2025 · Paper II

Q4(b). Nucleophilic aromatic substitution

Question

Complete p-Z-nitrobenzene with cyanide and show the mechanism.

Answer in brief

If Z is a leaving group such as halogen, CN replaces Z to give 4-nitrobenzonitrile.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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Topic notes: aromatic substitution (electrophilic, nucleophilic) and heterocycles, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversnucleophilic aromatic substitutionSNArMeisenheimer complex4-nitrobenzonitrileaddition–elimination

All parts of Question 4