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  3. Chemistry
  4. Identify a reagent from the following list which can easily distinguish between 1 -butyne and 2-butyne.

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Q. Identify a reagent from the following list which can easily distinguish between $1$ -butyne and $2$-butyne.

IIT JEEIIT JEE 2002Hydrocarbons

Solution:

Ammoniacal $CuCl_2$ forms red precipitate with terminal alkynes, can be used to distinguish terminal alkynes from internal alkynes:
$CH_3 - CH_2- C \equiv C- H + CuCl_2 \xrightarrow{NH_3 (aq)}$
$CH_3 - CH_2- C \equiv C^-Cu^+ \downarrow$