Arrange the following compounds in increasing order of their dipole moment :

Dipole Moment Order | JEE Main PYQ | Chemical Bonding

Arrange the following compounds in increasing order of their dipole moment:

HBr, H₂S, NF₃ and CHCl₃

(A) HBr < H₂S < NF₃ < CHCl₃

(B) H₂S < HBr < NF₃ < CHCl₃

(D) CHCl₃ < NF₃ < HBr < H₂S

Correct Answer: NF₃ < HBr < H₂S < CHCl₃

Explanation

Dipole moment depends on molecular geometry and bond polarity.

NF₃ has very low dipole moment due to cancellation of bond dipoles.

HBr has moderate dipole moment due to polar H–Br bond.

H₂S has bent geometry, increasing net dipole moment.

CHCl₃ has highly polar C–Cl bonds arranged asymmetrically, giving the highest dipole moment.

Previous Year Questions – Chemical Bonding