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Q.

Which of the following will give a positive NaHCO3 test?

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a

Propyne

b

Ethanoic acid

c

Ethyne

d

Ethanol

answer is B.

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Detailed Solution

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Ethanoic acid will give a positive NaHCO3 test.

Ethanoic acid exhibits effervescence in the presence of sodium bicarbonate which proves its acidic nature. On the other hand, ethanol shows no effervescence in the presence of sodium bicarbonate. This test is also used to prove the neutrality of alcohol.

The reaction taking place is 

CH3COOH+NaHCO3CH3COONa+H2O+CO2 

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