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(D) The organic liquid $A$ reacts with conc. $H_2SO_4$ to form a colourless gas that decolourises bromine water and alkaline $KMnO_4$,indicating the g

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$C_2H_5OH$

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(D) The organic liquid $A$ reacts with conc. $H_2SO_4$ to form a colourless gas that decolourises bromine water and alkaline $KMnO_4$,indicating the gas is an alkene. Since the gas reacts with one mole of $H_2$,it is ethene $(CH_2=CH_2)$. The dehydration of ethanol $(C_2H_5OH)$ with conc. $H_2SO_4$ at $443 \ K$ yields ethene. Ethanol has a pleasant odour and a boiling point of $78\ ^\circ C$. The reaction is: $CH_3CH_2OH \xrightarrow{Conc. H_2SO_4} CH_2=CH_2 + H_2O$.

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