Answer Posted / ashok yadav

2+2 CYCLO ADDN IS PHOTO CHEMICALLY ALLOWED.ACCO TO AROMATIC
TRANSITON STATE THEAORY ,IT FORMS EVEN NO OF NODES.SO IT IS
HAVING HUCKEL TRANSITION STATE WIT 4nELECTRONS.SO IT IS
PHOTO CHEMICALLY ALLOWED REAN.THE ADDN SHOLD B SUPRA-SUPRA
FACIAL.

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