Indian Forest Service (Mains), Chemistry optional · 2023 · Paper II
Q7(h). Hydration of phenylacetylene
Question
C₈H₆ gives C₈H₈O with dilute sulfuric acid and the printed mercury sulfate reagent. Predict approximate proton shifts and multiplicities.
Answer in brief
The intended alkyne is phenylacetylene and the hydration product is acetophenone: a 3H singlet near 2.6 ppm and five aromatic H near 7.4–8.0 ppm.
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Coversalkyne hydrationphenylacetyleneacetophenone NMRHgSO₄Markovnikov addition
All parts of Question 7
- 7(a) Photochemistry of a rigid aryl ketone5 marks
- 7(b) Sequential anionic polymerization5 marks
- 7(c) Neoprene and chloroprene5 marks
- 7(d) Why polymers have average molar masses5 marks
- 7(e) Two unsaturated ester isomers5 marks
- 7(f) Sanger determination of the N terminus5 marks
- 7(g) Chemical-shift separation in Hz5 marks
- 7(h) Hydration of phenylacetylene5 marks