(A)
Product A is 3, 4-dibromo-1-butene, which is more stable than 1, 4-dibromo-2-butene (B) at -15° C but is less stable than B at 60° C.
(B)
Product A is 1, 4-dibromo-2-butene, which is more stable than 3, 4-dibromo-1-butene (B) at -15° C but is less stable than B at 60° C.
(C)
Product A is 3, 4-dibromo-1-butene, which has a lower activation energy for formation than 1, 4dibromo-2-butene (B) at -15° C but has a higher activation energy for formation than B at 60° C.
(D)
Product A is 1, 4-dibromo-2-butene, which has a lower activation energy for formation than 3, 4-dibromo-1-butene (B) at -15° C but has a higher activation energy for formation than B at 60° C.
(E)
Product A is 3, 4-dibromo-1-butene, which has a lower activation energy for formation than 1, 4dibromo-2-butene (B) but is less stable than B.
(F)
Product A is 1, 4-dibromo-2-butene, which has a lower activation energy for formation than 3, 4-dibromo-1-butene (B) but is less stable than B.
