JEE Main Chemistry question

Ozonolysis of benzene, followed by hydrolysis, gives

(A)One mole of glyoxal only
(B)Three moles of glyoxal (OHC–CHO)Correct
(C)Six moles of formaldehyde
(D)Three moles of oxalic acid

Answer: (B)

Solution

Ozone adds across all three formal double bonds of the (Kekulé) benzene ring, and hydrolytic cleavage of the resulting triozonide opens the ring completely

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Question ID VK-142421