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Question

Acetal formation is a reversible reaction

Under what conditions, the reaction can be forced to proceed only in right (forward) direction ?


A

Using excess of alcohol

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B

Using high temperature

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C

Using dilute acid and excess of alcohol

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D

Using dry acid and excess of alcohol

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Solution

The correct option is D

Using dry acid and excess of alcohol


Being reversible reaction, the backward reaction i.e. acetal -hemiacetal step can be restricted by minimizing water content, i.e. by using dry HCI. The step hemiacetal aldehyde can be restricted by using excess of alcohol.


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