JEE Main Chemistry question

Which of the following acids (1 mol) does not give a cyclic anhydride on heating?

(A)Adipic acid
(B)Terephthalic acidCorrect
(C)Succinic acid
(D)Phthalic acid

Answer: (B)

Solution

Cyclic anhydride formation requires the two carboxyl groups to be positioned so that a 5- or 6-membered ring can form on dehydration. Succinic acid (4-membered chain between the two COOH, forming a 5-membered anhydride) and adipic acid/phthalic acid (similarly well-positioned, phthalic acid's ortho carboxyls

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Question ID VK-149488