Question

Place the following in order of increasing dipole moment.

i- HI
ii - HF
iii - HCl.

a) HIb) HIc) HCld) HFe) HCl

Answer 1

The order of increasing dipole moment among HI, HCl, and HF is HI (smallest), HCl, and then HF (largest), with electronegativity difference being a more significant factor than bond length.

Step-by-step explanation:

The student asked to place the following in order of increasing dipole moment: HI, HF, and HCl. To answer this, we need to consider both bond length and electronegativity difference, as they both play a role in determining the dipole moment of a molecule. As we know from provided references, the bond length increases in the order FCl>Br>I. Since electronegativity difference has a greater impact on dipole moment than bond length does, we can predict that HF, with the largest electronegativity difference between hydrogen and fluorine, will have the largest dipole moment, followed by HCl, and then HI with the smallest dipole moment.

1. HI
2. HCl
3. HF

The correct sequence for increasing dipole moment is therefore: HI, HCl, HF.