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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Figure $\xrightarrow[{0\, - \,5\,\,{\,^o}C}]{{HN{O_2}}}$ $P$ $\xrightarrow{{HB{F_4}}}Q$ $\xrightarrow[{Cu,\,\,\Delta }]{{NaN{O_2}}}R$