The incorrect statement regarding ethyne is

Ethyne (acetylene, C₂H₂) has a C≡C triple bond.

(A) C-C bond in ethyne is shorter than ethene — TRUE (triple bond < double bond).

(B) Both carbons are sp hybridized — TRUE.

(D) C-C bond in ethyne is weaker than ethene — FALSE. Triple bond (837 kJ/mol) is stronger than double bond (614 kJ/mol).

The incorrect statement is Option 4.

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