Q43: A sigmatropic rearrangement involves the loss and
Q44: Photochemical electrocyclic reactions always involve disrotatory movement
Q45: The Hoffman rearrangement transforms an amide into
Q46: Sigmatropic rearrangements are photochemically forbidden.
Q47: OsO4 transforms an alkene into a trans-diol.
Q49: Ozone transforms an alkene into carbonyls.
Q50: A dieneophile is activated with electron withdrawing
Q51: A reaction of an alkyne and an
Q52: [6+4] cycloadditions are thermally forbidden.
Q53: Electrocyclic ring closures involve the loss of
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