JEE Main Chemistry question

Chemistry Aldehydes, Ketones and Carboxylic Acids JEE Main

[Roorkee 1998] In the reaction C₈H₆O₄ —Δ→ X —NH₃→ (a ring bearing both –CONH₂ and –COOH), the intermediate "X" is

(A)Phthalic anhydrideCorrect
(B)Phthalic acid
(C)*o*-Xylene
(D)Benzoic acid

Answer: (A)

Solution

C₈H₆O₄ is phthalic acid (benzene-1,2-dicarboxylic acid), which dehydrates on heating to phthalic anhydride

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Question ID VK-140044