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The reagent ‘R’ in the given sequence of chemical reaction is

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The reagent ‘R’ in the given sequence of chemical reaction is

(1) H2O

(2) CH3CH2OH

(3) HI

(4) CuCN/KCN

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Correct answer: (2) CH3CH2OH

Explanation:

R : CH3CH2OH Certain mild reducing agents like hypophosphorus acid or ethanol reduce diazonium salts to arene and themselves get oxidised to phosphorous acid and ethanal respectively.
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