Benzenediazonium chloride + X gives benzenediazonium tetrafluoroborate, which with Y (Cu, Δ) gives nitrobenzene (Major Product).
Consider the given chemical reaction, identify X and Y
Benzenediazonium chloride + X gives benzenediazonium tetrafluoroborate, which with Y (Cu, Δ) gives nitrobenzene (Major Product).
Consider the given chemical reaction, identify X and Y

Official answer: B
Steps. HBF₄ gives the diazonium fluoroborate (X); heating with NaNO₂ and Cu (Y) replaces N₂⁺ by NO₂, giving nitrobenzene.
(B)