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Synthetic Dyes

Which of the ...

Question

Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?

H_{2} (e x c e s s) / P t

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L i A l H_{4}

in ether

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F e

and

H C l

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S n

and

H C l

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Solution

The correct option is B $L i A l H_{4}$ in ether
$L i A l H_{4} / e t h e r$ reduces aryl nitro compounds to azo compounds
$2 C_{6} H_{5} {N O}_{2} L i A l H_{4} - --- \to C_{6} H_{5} N = N - C_{6} H_{5}$
nitrobenzene azobenzene

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