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Question

An organic compound 'A' produces a gas with brisk effervescence when sodium bicarbonate is added to it. The compound 'A' contains same number of carbons as in ethane. The compound 'A' reacts with ethanol to form a sweet smelling compound 'C' in presence of conc. H2SO4. A and C respectively are :

A
ethanoic acid and ethyl ethanoate
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B
methanoic acid and ethyl methanoate
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C
ethanoic acid and sodium ethanoate
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D
methanoic acid and sodium methanoate
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Solution

The correct option is B ethanoic acid and ethyl ethanoate
Ethanoic acid reacts with sodium bicarbonate, to form carbon dioxide which produces effervescence as:

CH3COOH+NaHCO3CH3COONa+H2O+CO2

Also, ethanoic acid reacts with ethanol to form the ester - ethyl ethanoate as follows:

CH3COOH+C2H5OHconc. H2SO4CH3COOCH2CH3+H2O

Thus, A is ethanoic acid and C is ethyl ethanoate.

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