Regents Chemistry Exam August 2024 Question 36
36 Which formula represents a molecule with the most polar bond?
(1) F2 (3) HCl
(2) H2 (4) HBr
Solution:
To find the most polar bond, we need to determine the electronegativity difference between the two elements sharing the bond. The higher the electronegativity difference, the more polar the bond is. Electronegativity values can be found in Table S on the Reference Table. For example electronegativity of hydrogen is 2.2 and electronegativity of chlorine is 3.2. Subtracting the smaller number from the bigger, we get 3.2-2.2=1. Similarly, you can calculate the electronegativity difference value for all of the answer choices. The electronegativity difference for choices 1 and 2 is zero since the bond is shared by two same atoms. Choice 3 is the correct answer.
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