The reagents that can be used to convert benzenediazonium chloride to benzene are __________.

• In case of phosphonic acid (iii) H3PO2 it reduces benzene and the diazonium group gets replaced by hydrogen and itself oxidizes to H3PO3.



• benzenediazonium chloride participates in de-amination reaction with (ii) CH3CH2OH . it converts to bezene and as side products acetaldehyde , nitrogen and HCl gas is formed.



• Options (i) and (iv) are incorrect.

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