Is the dipole moment difference (in electron unit) in the order HF > HCl > HBr > HI?
A. True
B. False

The order of dipole moments for the hydrogen halides HF, HCl, HBr, and HI is determined by the electronegativity difference between the hydrogen atom and the halogen atom in each molecule. The greater the electronegativity difference, the larger the dipole moment.

Electronegativity values (Pauling scale):

Hydrogen (H): 2.20
Fluorine (F): 3.98
Chlorine (Cl): 3.16
Bromine (Br): 2.96
Iodine (I): 2.66
Now, let's calculate the electronegativity differences and order the molecules accordingly:

HF: Electronegativity difference = 3.98 (F) - 2.20 (H) = 1.78
HCl: Electronegativity difference = 3.16 (Cl) - 2.20 (H) = 0.96
HBr: Electronegativity difference = 2.96 (Br) - 2.20 (H) = 0.76
HI: Electronegativity difference = 2.66 (I) - 2.20 (H) = 0.46
Based on these calculations, the order of dipole moments should be:

HF > HCl > HBr > HI

So, the statement "HF > HCl > HBr > HI" is True.