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Q.

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

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a

C H_{2} C H_{2} OH

b

C H_{3} CHO

c

C H_{3} OH

d

C H_{3} COOH

answer is A.

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Detailed Solution

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Ethanoic acid ( $C H_{3} COOH$ ) will give a pleasant smell of ester when heated with ethanol and a small quantity of concentrated sulphuric acid.
The only time ethanol and ethanol interact is when an acidic medium is present. These two combine to create acetal.

Therefore, only Ethanoic acid also known as acetic acid creates an ester that has a pleasant scent when it reacts with ethanol in the presence of strong sulphuric acid as a catalyst.

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