JEE Main Chemistry question

A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is [K CET 2010]

(A)1,1-dibromopropane
(B)2,2-dibromopropane
(C)1,2-dibromoethane
(D)1,4-dibromobutaneCorrect

Answer: (D)

Solution

An intramolecular Wurtz reaction (both halogens on the same molecule, removed by Na, with the two resulting ends bonding to each other) closes a ring.

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Question ID VK-142323