To distinguish between ethene and ethyne, we should use:

Question

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Answer 1

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.

$C_{2} H_{2}$ + $2 A g N O_{3}$ = $A g_{2} C_{2}$ + $2 H N O_{3}$

2. Similarly, ethyne forms a red precipitate of copper acetylide ( $C u_{2} C_{2}$ ) when it is passed through ammoniacal cuprous chloride solution.

Ethene does not react with $A g N O_{3}$ or $C u_{2} C_{2}$ solution.
Hence, the correct option is $C$

Answer 2

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.

$C_{2} H_{2}$ + $2 A g N O_{3}$ = $A g_{2} C_{2}$ + $2 H N O_{3}$

2. Similarly, ethyne forms a red precipitate of copper acetylide ( $C u_{2} C_{2}$ ) when it is passed through ammoniacal cuprous chloride solution.

Ethene does not react with $A g N O_{3}$ or $C u_{2} C_{2}$ solution.

Hence, the correct option is $C$