Which of the following dicarboxylic acids gives a cyclic.anhvdride on heating?

Which of the following dicarboxylic acids gives a cyclic.anhvdride on heating?
  1. $\mathrm{CH}_{2}(\mathrm{COOH})_{2}$
  3. $\mathrm{HOOC}\left(\mathrm{CH}_{2}ight)_{4} \mathrm{COOH}$
  4. $\mathrm{HOOC}\left(\mathrm{CH}_{2}ight)_{5} \mathrm{COOH}$

Solution

Succinic acid on heating forms its anhydride. Option $1,3 \& 4$ are unstable. Only option 2 is stable.
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Asked in: JEE-TOPICTESTS-CHEMISTRY

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