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MissPhiladelphia
For the question given above, option 2 which is H-Cl pair of atoms has the most polar bond among the four of them. 

The larger the value of the electronegativity, the greater the atom’s strength to attract a bonding pair of electrons. Hydrogen has an electronegativity of 2.1, and chlorine has an electronegativity of 3.0. The electron pair that is bonding HCl together shifts toward the chlorine atom because it has a larger electronegativity value.
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Among the presented bonds, the most polar is H-Cl.

What is polarity?

Polarity is a separation of electric charge leading to a molecule or its chemical groups having an electric dipole moment.

The higher the difference in electronegativity, the more polar the bond.

We will calculate the difference in electronegativity for each bond.

  • (1) H−Br

ΔEN = |EN(H)-EN(Br)| = |2.2-3.0| = 0.8

  • (2) H−Cl

ΔEN = |EN(H)-EN(Cl)| = |2.2-3.2| = 1.0

  • (3) I−Br

ΔEN = |EN(I)-EN(Br)| = |2.7-3.0| = 0.3

  • (4) I−Cl

ΔEN = |EN(I)-EN(Cl)| = |2.7-3.2| = 0.5

Among the presented bonds, the most polar is H-Cl.

Learn more about polarity here: https://brainly.com/question/8857494

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