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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 · 2022 · Paper II

Q8(a). N–H identification in hexamethylenediamine

Question

How can PMR establish an N–H bond in HMDA (hexamethylenediamine), described in the question as a nylon-6 starting material?

Answer in brief

Identify an exchangeable NH₂ resonance and show that it disappears after a D₂O shake; HMDA is a nylon-6,6 monomer, not the usual nylon-6 monomer.

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Topic notes: IR spectroscopy: group frequencies, carbonyl stretching and hydrogen bonding, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversPMR spectroscopyD2O exchangehexamethylenediamineN–H protonnylon-6,6

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