A) 1,1-dibromopropane
B) 2, 2-dibromobutane
C) 1, 2-dibromoethane
D) 1, 4-dibromobutane
Correct Answer: D
Solution :
\[\omega \text{-}\]dihalides when reacts with sodium metal, gives cyclic hydrocarbons. This is an example of intra molecular Wurtz reaction. \[\underset{\begin{smallmatrix} | \\ Br \end{smallmatrix}}{\mathop{C}}\,{{H}_{2}}-C{{H}_{2}}C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ Br \end{smallmatrix}}{\mathop{C}}\,{{H}_{2}}\xrightarrow[-2NaBr]{Na}\underset{cyclobutane}{\mathop{}}\,\]
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