MCQ
The above reaction completes with the mechanism


- ANucleophilic substitution -elimination mechanism
- BElectrophilic addition -elimination mechanism
- CElectrophilic substituion -elimination mechanism
- ✓Nucleophilic addition -elimination mechanism

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$(I)$ coloured ions in aqueous solution
$(II)$ oxides of nitrogen are formed on reaction with concentrated $HNO_3$
$(III)$ chlorides of formula $MCl_2$ and $MCl_3$
Reason : Energy of the activated complex is higher than the energy of reactant molecules.
