Which of the following reagents may be used to distinguish between ethene and ethyne ?

Ammoniacal

A g N O_{3}

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K M n O_{4}

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B r_{2} / C C l_{4}

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A l C l_{3}

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Solution

The correct option is A Ammoniacal $A g N O_{3}$
Ammonical silver nitrate solution(Tollen's reagent) is used to distinguish between ethene and ethyne.
Ethyne + tollens reagent --------> silver acetylide (white ppt) + $N H_{3}$ + $H_{2} O$
Ethene + tollens reagent ---------> no reaction

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