'X' is the isomer of $\text{C}_6\text{H}_{14}$. It has four primary carbons and two tertiary carbons. 'X' can be prepared from which of the following reaction?
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The Wurtz reaction ($2\text{R-X} + 2\text{Na} \to \text{R-R} + 2\text{NaX}$) is a powerful method for making symmetrical alkanes by coupling two alkyl halide molecules. To identify the reactant, mentally cleave the target symmetrical alkane at the middle bond.
