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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
Explanation
Wurtz coupling doubles the carbons, so the product has < 4 C only if A has 1 C.
Detailed Solution
$CH_4\ (A) \xrightarrow{Br_2/h\nu} CH_3Br \xrightarrow[\text{Wurtz reaction}]{Na/\text{dry ether}} CH_3-CH_3$
Ethane has fewer than four carbon atoms, so A is methane ($CH_4$).