Question

Arrange the following bent molecules in order of decreeing dipole moment.
1. F2O, H2O,Cl2O
Arrange the following linear molecules in order of decreasing dipole moment
1. HI, HBr, HCl,HF

Answer 1

The right order is:
1. H2O, F2O, Cl2O

2. HF, HCl, HBr, HI

I hope that this is the answer you are looking for.

Answer 2

Answer:

1) $H_{2} O\ >\ F_{2} O \ >  \ Cl_{2} O$.

2) HF > HCl > HBr > HI.

Explanation:

A dipole moment is measurement of the separation of  two opposite electrical charges. It is a vector quantity which means it has both magnitude and direction.

In the first case,  $H_{2} O$ has higher dipole moment than fluorine and chlorine. $H_{2} O$, Water has highest dipole moment because there is more electrons of oxygen than hydrogen. than fluorine has the high dipole moment than chlorine because fluorine has high electrongative than chlorine.

In the second case, arrangement is done on the basis of electronegativity, Fluorine is the highest electronegative element in the periodic table. Chlorine is the second highest electronegative element, than bromine and than iodine.