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Question

The reagent ′R′ in the given sequence of a chemical reaction is:

A
HI
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B
CuCN/KCN
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C
H2O
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D
CH3CH2OH
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Solution

The correct option is D CH3CH2OH
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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