Question

Which bond is most polar? 1. H—F 2. H—Cl 3. H—Br 4. H—I

Answer 1

The answer is #1. Hydrogen to Flouride. This is because flouride is the most reactive element in groups 1 - 2 and 13 - 17. Meaning the most polar element is Flouride.

Answer 2

Answer: The most polar bond is
`H-F`

Step-by-step explanation:

Polarity of a bond is judged on the basis of electronegativity difference between the elements forming a bond.

More the electronegativity difference, more polar will be the bond and vice-versa.

The electronegativities of the following elements are:

Electronegativity of Hydrogen = 2.1

Electronegativity of Fluorine = 3.98

Electronegativity of Chlorine = 3.16

Electronegativity of Bromine = 2.96

Electronegativity of Iodine = 2.66

• For HF

Electronegativity difference = 3.98 - 2.1 = 1.88

• For HCl

Electronegativity difference = 3.16 - 2.1 = 1.06

• For HBr

Electronegativity difference = 2.96 - 2.1 = 0.86

• For HI

Electronegativity difference = 2.66 - 2.1 = 0.56

From the above calculation, it is visible that the electronegativity difference of hydrogen fluoride is the maximum, so the most polar bond will be of H-F only.

Hence, the most polar bond is
`H-F`