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UPSC Civil Services (Mains)

Chemistry optional

  • 2 papers
  • 250 marks each
  • 3 h per paper
  • 5 of 8 questions, Q1 and Q5 compulsory

Paper II covers organic chemistry and spectroscopy.

UPSC Civil Services (Mains), Chemistry optional · 2024 · Paper II

Q5(d). Higher λmax in each pair

Question

In the UV spectra of the following pairs (i) to (v), which compound (A or B) will have the higher λmax? [structures of the five pairs given in the paper]

Answer in brief

(i) A, (ii) B, (iii) B, (iv) A, (v) B.

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Topic notes: UV spectroscopy and Woodward–Fieser rules, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversUV spectroscopyλmaxWoodward–Fieser rulesScott rulessteric inhibition of resonancecharge-transfer band

All parts of Question 5