JEE Main Chemistry question

What would be the product formed when 1-bromo-3-chlorocyclobutane reacts with two equivalents of metallic sodium in ether? [IIT JEE 2005]

(A)Bicyclo[1.1.0]butaneCorrect
(B)Cyclobutene
(C)1,3-cyclobutadiene
(D)Spiropentane

Answer: (A)

Solution

This is an intramolecular Wurtz reaction. Sodium removes both halogens from the 1,3-disubstituted cyclobutane and the two resulting carbanion/radical centres (at C-1 and C-3, directly

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Question ID VK-142131