Although chlorobenzene does not undergo the U | vedclass

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(A) The Ullmann reaction involves the coupling of aryl halides with copper powder to form biaryls. Chlorobenzene is generally unreactive due to the st

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$-NO_2$

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(A) The Ullmann reaction involves the coupling of aryl halides with copper powder to form biaryls. Chlorobenzene is generally unreactive due to the strong $C-Cl$ bond and the electron-donating nature of the chlorine atom,which reduces the electrophilicity of the carbon atom. However,the presence of strong electron-withdrawing groups like the nitro group $(-NO_2)$ at the $ortho$ $(o-)$ or $para$ $(p-)$ positions increases the electrophilicity of the carbon atom attached to the chlorine,thereby facilitating the reaction. Therefore,the presence of the $-NO_2$ group makes the Ullmann reaction possible.

Although chlorobenzene does not undergo the Ullmann reaction,the presence of which group at the $o-$ and $p-$ positions of chlorobenzene makes it possible to undergo the Ullmann reaction?

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