In the preparation of an ester, the commonly used dehydrating agent is _________.

phosphorus pentoxide

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anhydrous calcium carbide

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anhydrous aluminium chloride

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concentrated sulphuric acid

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Solution

The correct option is D concentrated sulphuric acid
Dehydrating agents remove water from a compound. Concentrated sulphuric acid is the common dehydrating agent used for preparing esters. A carboxylic acid reacts with an alcohol in the presence of conc. sulphuric acid to form an ester. This process is known as esterification.

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Reactions in which sulphuric acid is used as a dehydrating agent are endothermic by nature.

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