A gas decolourises Bayer's reagent but does n | vedclass

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(A) Bayer's reagent $(1\% 	ext{ alkaline } KMnO_4 	ext{ solution})$ is used to detect the presence of unsaturation (double or triple bonds) in organ

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Ethene

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(A) Bayer's reagent $(1\% 	ext{ alkaline } KMnO_4 	ext{ solution})$ is used to detect the presence of unsaturation (double or triple bonds) in organic compounds. Both alkenes and alkynes decolourise it.Tollen's reagent (ammoniacal silver nitrate) reacts only with terminal alkynes (alkynes having a hydrogen atom attached to a triply bonded carbon) to form a white precipitate of silver acetylide.$1.$ Ethene $(CH_2=CH_2)$ is an alkene. It decolourises Bayer's reagent due to the presence of a double bond but does not react with Tollen's reagent because it is not a terminal alkyne.$2.$ Ethyne $(CH \equiv CH)$ is a terminal alkyne. It decolourises Bayer's reagent and also reacts with Tollen's reagent.$3.$ Ethane and Methane are saturated hydrocarbons (alkanes) and do not react with either reagent.Therefore,the gas that decolourises Bayer's reagent but does not react with Tollen's reagent is Ethene.

$A$ gas decolourises Bayer's reagent but does not react with Tollen's reagent. This gas is:

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