Which of the following is the most polar?

Options

A. `C Cl_4`
B. `CHCl_3`
C. `CH_3OH`
D. `CH_3Cl`

Answer

C

Explanation

In `CHCl_3` the vector summation of `3 C - Cl` bonds is very small so the net dipole moment is smaller than `CH_3Cl`. In `CH_3 OH`, the electronegativity difference of O and C is large so it will have higher dipole moment. `C Cl_4` will have zero dipole moment because of symmetrical structure the four `C - Cl` bond dipole moment will cancel.
So the correct order of dipole moments is :
`C Cl_4 lt CHCl_3 lt CH_3Cl lt CH_3OH`.