Q82 · CSIR NET Chemistry, December 2014
Paper: CSIR NET December 2014 · Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Pericyclic Reactions – General · Marks: 2 · Difficulty: Hard
The major product of the following reaction is 
(a)
(b)
(c)
(d)
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
The electron-rich (p-NMe₂) arylalkyne and TCNE undergo [2+2] cycloaddition and then retro-electrocyclic ring opening of the cyclobutene. The product is the 1,1,4,4-tetracyanobutadiene (c).
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