Question

Which of the following are arranged in decreasing order of dipole moment?

Options

• CH₃CI, CH₃Br, CH₃F

• CH₃CI, CH₃F, CH₃Br

• CH₃Br, CH₃CI, CH₃F

• CH₃Br, CH₃F, CH₃CI

Answer 1

CH₃CI, CH₃F, CH₃Br

Explanation: 

Dipole moment of CH₃CI is more than CH₃F due to larger C,X bond. Also electronegativity of Br being less than F and Cl and thus inspite of larger C,X bond dipole moment of CH₃Br is lowest.