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  • Try this! Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride ?

Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride ?

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

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best_answer

 

Anhydride formation from carboxylic acid -

–  Except formic acid, lower monocarboxylic acid on heating with dehydrating agent forms anhydrides.

–  It involves cleavage of  C - OH bond.

- wherein

RCOOH\overset{P_{2}O_{5}}\rightarrow (RCO)_{2}O

As we have learned about adipic acid

In adipic acid

CO_{2} - \left ( CH_{2} \right )_{4} - CO_{2}H\overset{dehygrating agent}{\rightarrow}

The same membred cyclic anhydride is very stable

 


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