The reagents used in proper sequence are

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NaNO2 + H2SO4 / 273K, Cu2I2

NaNO2 + HCl / 278K, Cu/HI

NaNO2 + HCl / 273K, KI

HNO3/273K, Cu2I2

answer is C.

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Detailed Solution

NaNO2 + HCl / 273K – 278K produces HNO2 in situation. It converts 10 aryl amine to Benzene diazonium chloride.

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