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(A) $Step$ $1$: $p$-toluidine ($4$-methylaniline) reacts with $NaNO_2$ and $HCl$ at $273-278 \ K$ to form $4$-methylbenzenediazonium chloride.$Step$ $

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$4$-methylphenyl-deuteride

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(A) $Step$ $1$: $p$-toluidine ($4$-methylaniline) reacts with $NaNO_2$ and $HCl$ at $273-278 \ K$ to form $4$-methylbenzenediazonium chloride.$Step$ $2$: The diazonium salt reacts with $Cu_2Cl_2$ (Sandmeyer reaction) to form $4$-chlorotoluene.$Step$ $3$: $4$-chlorotoluene reacts with $Mg$ in dry ether to form $4$-methylphenylmagnesium chloride (a Grignard reagent).$Step$ $4$: The Grignard reagent reacts with $D_3O^+$ to replace the $-MgCl$ group with a deuterium atom,resulting in $4$-deuterotoluene (also known as $4$-methylphenyl-deuteride).

Identify the major product formed from the following reaction sequence.

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