Question

Test to distinguish between alkyne and alkene

Answer 1

Use Ammonical Cuprous Chloride soln. (Cu2Cl2).
In alkene - no change is observed.
In alkyne - Red ppt. of copper acetylide is formed.

Answer 2

Answer:

The test that is used to distinguish between alkyne and alkene is reaction with ammoniacal cuprous chloride.

Explanation:

Alkenes are the hydrocarbon that has a double bond between carbon and hydrogen atom while alkynes are the hydrocarbons containing a triple bond between carbon and hydrogen atom.

Ammoniacal cuprous chloride:

Ammoniacal cuprous chloride is blue in color. When ammoniacal cuprous chloride is added to alkene and alkynes, then in the case of alkene the the color of the solution remains unchanged while in the case of alkynes the color of the solution changes from blue to red color.

Thus, on carrying out the reaction between alkenes or alkynes with ammoniacal cuprous chloride one can easily distinguish between alkyne and alkene.

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