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Answer: 4) +O- Among the given resonating structures, the structure D is not an acceptable resonating structure because following two reasons. presence of positive charge on highly electronegative exygen atom such type of structures are highly unstable con not be formed. The structure D is actually a tautomer because of transfer of hydrogen atom while delocalization of elections only occurs in resonating structures Answer 5) OCH 3 + T OCH3 heat t A. diene dienophile A is only possible product among all because all the other four products have some stereochemistry of - e-OCH3 and -CH₃ groups which is not possible . According to cis principle cis dienophile gives eis product while toons gives trans product: Summe a me Moromel Mea ome or of product Actual stereo
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