why is CH3SH polar?
Why is CH3SH polar? I understand that the electronegativity difference between carbon (C) and sulfur (S) is 2.5 - 2.5, which is almost 0. Does this mean the molecule should be nonpolar? Additionally, the difference in electronegativity between carbon (C) and hydrogen (H) is 2.5 - 2.1, which equals 0.4. Shouldn't this also classify as nonpolar?
1 Answers
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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