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when Benzenediazium chloride react with HBF4 it form compound X. X on heating gives Y and Z alongwith BF3. X on reaction with NaNO2, Cu/heat it again form A and Z but with NaBF4

Products A and Y respectively are

A
Fluorobenzene and Benzene
B
Nitrobenzene and fluorobenzene
C
Fluorobenzene and Nitrobenzene
D
Nitrobenzene and Benzene
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