JEE Main Chemistry question

Among the species CO_2, CH_3COO^-, CO, CO_3^{2-}, HCHO, which has the weakest C–O bond?

(A)CO
(B)
(C)Correct
(D)

Answer: (C)

Solution

Comparing C–O bond orders: CO has bond order 3 (triple bond, strongest), has bond order 2 (each C=O double bond), has a delocalised C–O bond order of 1.5 (2 equivalent resonance structures), and

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Question ID VK-156295