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【单选题】
比较取代羧酸的酸性大小是:( )。 FCH2COOH(I), ClCH2COOH(II), BrH2COOH(III), ICH2COOH(IV)
A.
I>II>III>IV
B.
IV>III>II>I
C.
II>III>IV>I
D.
IV>I>II>III
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