The reagent 'R' in the given sequence of chemical reaction is:
H2OH_2OH2O
CH3CH2OHCH_3CH_2OHCH3CH2OH
HI
CuCN/KCN
The reaction shows the reduction of a diazonium salt to a benzene derivative using ethanol (CH3CH2OHCH_3CH_2OHCH3CH2OH).
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