Which of the following is not used to disting | vedclass

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(A) Ethene is an alkene $(C_2H_4)$ and ethane is an alkane $(C_2H_6)$.$A.$ Iodine in $CCl_4$ is generally not used for unsaturation tests because the

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Iodine in $CCl_4$

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(A) Ethene is an alkene $(C_2H_4)$ and ethane is an alkane $(C_2H_6)$.$A.$ Iodine in $CCl_4$ is generally not used for unsaturation tests because the reaction is reversible and slow.$B.$ Bromine in $CCl_4$ (Bromine water test) is used to distinguish alkenes from alkanes. Alkenes decolorize the reddish-brown color of bromine,while alkanes do not.$C.$ Alkaline $KMnO_4$ (Baeyer's reagent) is used to distinguish alkenes from alkanes. Alkenes decolorize the purple color of $KMnO_4$ to form a brown precipitate of $MnO_2$,while alkanes do not react.$D.$ Ammoniacal $Cu_2Cl_2$ (Cuprous chloride) is used specifically to identify terminal alkynes (forming red precipitates of copper acetylides). It does not react with ethene or ethane.Since both $A$ and $D$ are not used to distinguish ethene from ethane,but $D$ is a specific reagent for terminal alkynes,$A$ is the most appropriate choice in the context of standard laboratory tests for unsaturation where iodine is ineffective.

Which of the following is not used to distinguish ethene from ethane?

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