Alkyl halide used in preparation of n-hexane in Wurtz reaction is. _______________

PLACEHOLDER ANSWER - the answer is a compound. Wurtz coupling joins two identical alkyl groups, so n-hexane needs a three-carbon chain. The alkyl halide is n-propyl bromide (1-bromopropane), $$2\text{CH}_3\text{CH}_2\text{CH}_2\text{Br} + 2\text{Na} \rightarrow \text{CH}_3(\text{CH}_2)_4\text{CH}_3 + 2\text{NaBr}$$.