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The reaction \(\mathrm{R{-}CO{-}N_3 \xrightarrow{\Delta,\ H_2O} R{-}NH_2}\) is an example of

Question and options

The reaction R−CO−N3→Δ, H2OR−NH2\mathrm{R{-}CO{-}N_3 \xrightarrow{\Delta,\ H_2O} R{-}NH_2} is an example of
  1. Cope rearrangement
  2. Curtius rearrangement
  3. Hofmann rearrangement
  4. Lossen rearrangement

Answer and explanation

Correct answer: B - Curtius rearrangement
R−CO−N3\mathrm{R{-}CO{-}N_3} (acyl azide) on heating loses N2\mathrm{N_2} to give an isocyanate, which water hydrolyses to R−NH2+CO2\mathrm{R{-}NH_2 + CO_2}: the Curtius rearrangement.

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