Which of the following will not give a pleasant smell of ester when heated with ethanol and a small quantity of concentrated sulphuric acid?

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CH₂CH₂OH

CH₃COOH

CH₃OH

CH₃CHO

answer is A, B, D.

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Detailed Solution

Ethanoic acid (CH₃COOH) 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.
The rest of the given options do not react.
Ethylene glycol is a diol, and it does not react with ethanol to form an ester in the presence of concentrated sulfuric acid.
Methanol is an alcohol, and it does not react with ethanol to form an ester. It would require a carboxylic acid or an acid derivative for ester formation.
Acetaldehyde is an aldehyde and does not react with ethanol to form an ester in the presence of concentrated sulfuric acid.

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