77. Photochemical reaction of 7-dehydrocholesterol to vitamin D3 involves two types of pericyclic reactions. What are those?
(A) Electrocyclic reaction and sigmatropic rearrangement
(B) Electrocyclic reaction and ene reaction
(C) Cycloaddition and electrocyclic reactions
(D) Cycloaddition reaction and sigmatropic rearrangement
(E) Ene reaction and sigmatropic rearrangement.
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