Decreasing order of C–C bond length is (I) C_2H_4 (II) ethane (III) benzene (IV) acetylene

JEE Main Chemistry question

Decreasing order of C–C bond length is (I) (II) ethane (III) benzene (IV) acetylene

(A)IV > III > I > II
(B)I > II > IV > III
(C)II > I > IV > III
(D)II > III > I > IVCorrect

Answer: (D)

Solution

Bond length decreases as bond order increases. Single C–C bond (ethane, order 1, ≈1.54 Å) is the longest, followed by the resonance-averaged C–C bond in benzene (order 1.5, ≈1.39 Å), then the C=C double

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Question ID VK-155959