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The reagent 'R' in the given sequence of chemical reaction is:
A
$CH_3CH_2OH$
B
HI
C
CuCN/KCN
D
$H_2O$
Detailed Solution
2,4,6-Tribromoaniline $\xrightarrow{NaNO_2 + HCl,\ 0-5^\circ C}$ diazonium chloride $\xrightarrow{CH_3CH_2OH}$ 1,3,5-tribromobenzene
Mild reducing agents like hypophosphorous acid or ethanol reduce diazonium salts to arenes (they themselves are oxidised to phosphorous acid and ethanal).
So R is $CH_3CH_2OH$.