Methanol can be distinguished from ethanol by

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(D) Ethanol $(CH_3CH_2OH)$ contains a $CH_3CH(OH)-$ group,which gives a positive iodoform test with $I_2 + NaOH$ to form yellow crystals of iodoform $

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$I_2 + NaOH$

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(D) Ethanol $(CH_3CH_2OH)$ contains a $CH_3CH(OH)-$ group,which gives a positive iodoform test with $I_2 + NaOH$ to form yellow crystals of iodoform $(CHI_3)$.Methanol $(CH_3OH)$ does not contain this group and does not give the iodoform test.Therefore,$I_2 + NaOH$ is used to distinguish between them.

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