The metallic powder that is used in Ullmann synthesis of diphenyl is

Manganese powder

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Chromium powder

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Magnesium powder

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Copper powder

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Solution

The correct option is D
Copper powder

Biaryls are available through coupling of the aryl halide with an excess of copper at elevated temperatures (200 °C). The active species is a copper(I)-compound which undergoes oxidative addition with the second equivalent of halide, followed by reductive elimination and the formation of the aryl-aryl carbon bond.

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