What is "R" in the following reaction?

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Solution

The correct option is A
When 3-methylaniline treated with $N a N O_{2}$ + HCl it gets converted into chlorine complex. When that complex reacted with $H B F_{4}$ It gets converted into Barium Fluoride complex. This complex reacts with $N a N O_{2}$ in presence of copper to give 3-Nitrotoluene.

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