JEE Main Chemistry question

Identify the product Y in the following reaction sequence: a cyclic diester of a glutarate-type diacid --Heat--> Ca salt --Zn–Hg, HCl, heat--> Y

(A)Pentane
(B)Cyclobutane
(C)CyclopentaneCorrect
(D)Cyclopentanone

Answer: (C)

Solution

Heating the calcium salt of a dicarboxylic acid whose two –COOH groups are suitably spaced causes intramolecular ketonic decarboxylation, forming a cyclic ketone (here, cyclopentanone, from a

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Question ID VK-149227