Acetal formation is a reversible reaction H -R - OH - H - WUnder what conditions- the reaction can be forced to proceed only in right forward direction -A- Using excess of alcoholB- Using high temperatureC- Using dry acid and excess of alcoholD- Using dilute acid and excess of alcohol

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Standard XII

Chemistry

Acid Catalysed Acetal Formation

Acetal format...

Question

Acetal formation is a reversible reaction

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

Using excess of alcohol

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Using high temperature

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Using dilute acid and excess of alcohol

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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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Q. A carboxylic acid ester is prepared commonly by reacting a carboxylic acid with excess of an alcohol in the presence of a small quantity of a strong acid such as

c o n c . H_{2} S O_{4}

as a catalyst. The reaction is reversible and generally the equilibrium constant for the esterification is close to

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The correct statement(s) is/are__________.

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Acetal formation is a reversible reaction Under what conditions, the reaction can be forced to proceed only in right (forward) direction ?

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.

Acetal formation is a reversible reaction

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

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.