JEE Main Chemistry question

Which of the following on treatment with Baeyer's reagent will give meso-tartaric acid?

(A)Fumaric acidCorrect
(B)Maleic acid
(C)Both (a) and (b)
(D)None of these

Answer: (A)

Solution

Baeyer's reagent (cold dilute alkaline KMnO₄) performs syn-dihydroxylation, adding both new OH groups to the same face of the double bond. For the trans (E) alkene fumaric acid, syn-addition of the two OH groups

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Question ID VK-149434