Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is

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🧠 The Wurtz Logic
Working backwards in organic chemistry is like a puzzle. The final product is a gas with less than  carbons. In the Wurtz reaction, the carbon count doubles. So the starting bromide must have had very few carbons.

🗺️ The Synthetic Ladder
1. Target: A gaseous hydrocarbon with  Carbons. Possible candidates: Ethane () or Propane ().
2. The Wurtz Step: If the product is Ethane (), the reactant must have been Methyl bromide ().
   
3. The Bromination Step: If the bromide is , the

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