Ethene and ethyne can be distinguished by:a)Bromine waterb)KMnO4solutionc)Ammoniacal Cuprous chloride solutiond)Any of the aboveCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Distinguishing between Ethene and Ethyne

Ammoniacal Cuprous chloride solution is used to distinguish between ethene and ethyne.

Explanation:

• Ethene and ethyne are both unsaturated hydrocarbons but they have different properties.

• Ammoniacal Cuprous chloride solution, also known as Fehling's solution, is used to distinguish between them.

• When ethyne is treated with Fehling's solution, a red precipitate of cuprous acetylide is formed. This is because ethyne is a terminal alkyne and it contains a triple bond between the two carbon atoms. This triple bond is very reactive and can easily reduce cupric ions (Cu2+) to cuprous ions (Cu+), which then react with ammonia to form cuprous amine complexes. These complexes react with ethyne to form cuprous acetylide which is a red precipitate.

• When ethene is treated with Fehling's solution, there is no reaction. This is because ethene is an internal alkyne and it does not contain a triple bond between the two carbon atoms. Hence, it does not have the reactive triple bond required to reduce cupric ions to cuprous ions.

Therefore, Ammoniacal Cuprous chloride solution can be used to distinguish between ethene and ethyne as it forms a red precipitate with ethyne but not with ethene.

Answer

Saturated and unsaturated hydrocarbons can be distinguished by bromine water but to differentiate between alkene and alkyne ammoniacal cuprous chloride solution is used.

Answer

I think question is wrong.....we can distinguish them by bromine water and and Bayer's reagent I.e option A and B ....but am not sure about 3rd one

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