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Compounds I and II can be distinguished by using reagent

(I)

(II)

  4–Amino–2–methlbut–3–en–2–ol     4–Amino–2, 2–dimethylbut–3–yn–1–ol  

(1) NaNO2/HCI

(2) Br2/H2O

(3) HCI/ZnCI2 (anhydrous)

(4) Cu2CI2 + NH4OH