Which of the following reactions is not an example for nucleophilic addition-elimination reaction?

Question

CH₃CHO + NH₃ $\rightleftharpoons$ CH₃CH = NH + H₂O

CH₃CHO + NH₂OH $\rightleftharpoons$ CH₃CH = N $-$ OH + H₂O

CH₃CHO + C₆H₅NHNH₂ $\rightleftharpoons$ CH₃CH = N $-$ NHC₆H₅ + H₂O

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