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(D) $2 CuO + C \xrightarrow[\Delta]{ } 2 Cu + CO_2$ is not part of "Lassaigne's test"."Lassaigne's test" involves the fusion of an organic compound wi

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$2 CuO + C \xrightarrow[\Delta]{ } 2 Cu + CO_2$

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(D) $2 CuO + C \xrightarrow[\Delta]{ } 2 Cu + CO_2$ is not part of "Lassaigne's test"."Lassaigne's test" involves the fusion of an organic compound with metallic sodium to convert covalently bonded elements like $N$,$S$,and $X$ (halogens) into their ionic forms ($NaCN$,$Na_2S$,and $NaX$).The reaction $2 CuO + C \xrightarrow[\Delta]{ } 2 Cu + CO_2$ is used for the detection of carbon in organic compounds (Liebig's method),not for the elements detected by "Lassaigne's test".

Which one of the following reactions does $NOT$ belong to "Lassaigne's test"?

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