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Question

Which amonst the following will give a pleasant smell of ester when heated with ethanol and a small quantity of sulphuric acid?

A
CH3COCH3
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B
CH3CHO
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C
CH3OH
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D
CH3COOH
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Solution

The correct option is D CH3COOH
Any carboxylic acid on reaction with an alcohol in presence of concentrated sulphuric acid gives an ester.
In the given options, only CH3COOH, i.e., ethanoic acid on reaction with ethanol in presence of concentrated sulphuric acid will give an ester (ethyl ethanoate).
This reaction is called esterification reaction.
CH3COOH(aq) +CH3CH2OH(aq) conc.H2SO4−−−−− CH3CH2COOCH3(aq) + H2O(aq)

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