Consider the reaction : RCHO + NH2NH2 $ \to $ RCH $=$ N $-$ NH2 What sort of reaction is it?

Question

Consider the reaction :
RCHO + NH₂NH₂ $ \to $ RCH $=$ N $-$ NH₂

What sort of reaction is it?

Electrophilic addition-elimination reaction

Free radical addition-elimination reaction

Electrophilic substitution-elimination reaction

Nucleophilic addition-elimination reaction

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