18.以UV分析相同濃度的phenylephrine時,在0.1 M HCl及0.1 M NaOH中測得之最大吸收處的波長分別為273、
292 nm,吸光值(A)分別為110、182。在鹼性溶液中造成之差異係因下列何種現象產生?
(A)hyperchromic and bathochromic shifts
(B)hypochromic and hypsochromic shifts
(C)hyperchromic and hypsochromic shifts
(D)hypochromic and bathochromic shifts