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Question

To distinguish between ethene and ethyne, we should use:
  1. bromine water
  2. potassium permanganate solution
  3. all of the above
  4. ammonical cuprous chloride

A
all of the above
B
potassium permanganate solution
C
ammonical cuprous chloride
D
bromine water
Solution
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The two hydrocarbons can be easily distinguished by simple chemical tests, as ethyne molecule is supposed to have acidic hydrogen.

1. When ethyne is bubbled through ammoniacal silver nitrate solution, a yellow-white precipitate of silver acetylide would be formed.

C2H2 + 2AgNO3 = Ag2C2 + 2HNO3

2. Similarly, ethyne forms a red precipitate of copper acetylide (Cu2C2) when it is passed through ammoniacal cuprous chloride solution.

Ethene does not react with AgNO3 or Cu2C2 solution.

Hence, the correct option is C

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Q1
To distinguish between ethene and ethyne, we should use:
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Q2
State whether the following statements are True or False :

Bromine water can be used to distinguish ethyne and ethene.

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Q3
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