看两个基团的相对吸引电子的能力
C2H5OH 中 C2H5- 吸引电子能力没有-OH强
C6H5Cl 中 C6H5- 没有Cl强
但是 C6H5- 比C2H5- 吸引电子强
OH-也比Cl-强
因此 C2H5OH的偶极矩比 C6H5Cl强
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