why is CH3SH polar?

the electronegativity difference between C and S: 2.5 - 2.5 is almost 0, which means molecule should be non polar, right? C and H diff is 2.5 - 2.1 is 0.4, which also should be classified as non polar??

1 Answer

  • Methanethiol polar....

    Despite the fact that the electronegativity differences are small, the molecule is asymmetrical and has a significant net dipole moment (1.52D)

    .....H

    ..... |

    H−C−S ............... two lone pairs on S

    ..... |....

    .... H ....H

    It is the asymmetry and the two lone pairs, plus the slight electronegativity differences that give CH3SH it's net dipole moment.

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