Question

Which out of CH₃F and CH₃Cl has a higher dipole moment and why?

Answer 1

Dipole moment of CH₃CI is greater than that of CH₃F. The C-F bond in CH₃F is smaller than C-CI bond length in CH₃CI. The charge separation in C-F bond is more than in C-CI bond as fluorine being more electronegative than chlorine. The bond length has greater effect than the charge separation. Hence the dipole moment of CH₃CI is greater than that of CH₃F.