Carbon-carbon bond length is minimum in

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(C) The bond length between carbon atoms depends on the bond order. As the bond order increases, the bond length decreases.The order of bond lengths i

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Ethyne

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(C) The bond length between carbon atoms depends on the bond order. As the bond order increases, the bond length decreases.The order of bond lengths is: $C-C > C=C > C \equiv C$.$1.$ Ethane $(C_2H_6)$ has a $C-C$ single bond $(154 \ pm)$.$2.$ Ethene $(C_2H_4)$ has a $C=C$ double bond $(134 \ pm)$.$3.$ Ethyne $(C_2H_2)$ has a $C \equiv C$ triple bond $(120 \ pm)$.Therefore, the carbon-carbon bond length is minimum in Ethyne.

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