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
(C) NF3 < HBr < H2S < 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.

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