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Addition

Ethanol on re...

Question

Ethanol on reaction with alkaline $K M n O_{4}$ gives a compound $^{'} A^{'}$ while on heating with hot and conc. $H_{2} S O_{4}$ it gives another compound $^{'} B^{'}$ which decolourises bromine water. Compounds $^{'} A^{'}$ and $^{'} B^{'}$ respectively are

H C O O H

and

C H \equiv C H

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C H_{3} C O O H

and

C H_{2} = C H_{2}

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C H_{3} C H_{2} C O O H

and

C H_{2} = C H_{2}

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H C O O H

and

C H_{3} - C H_{3}

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Solution

The correct option is B $C H_{3} C O O H$ and $C H_{2} = C H_{2}$
Alkaline potassium permanganate oxidises ethanol to ethanoic acid.
(Image)
Therefore, compound $‘ A^{'}$ is ethanoic acid $(C H_{3} C O O H)$ .
Ethanol on heating with hot and conc. $H_{2} S O_{4}$ undergoes dehydration to give ethene $(C H_{2} = C H_{2})$ , which is an unsaturated hydrocarbon and therefore, decolourises bromine water.
Therefore, compound $‘ B^{'}$ is ethene $(C H_{2} = C H_{2})$ .
Hence, the correct answer is option (b).

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