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Which bond is most polar?(1) C–O (2) H–O(3) N–O (4) S–O

January 2018 NY Regents Chemistry Exam

37 Which bond is most polar? (1) C–O

(2) H–O

(3) N–O

(4) S–O

Solution:The polarity of the bond is based on the electronegativity difference. Electronegativity values can be found in Table S on the Reference Table. All we need to do is to find electronegativity value for each element holding a bond. Then, subtract the bigger number from the smaller number to find electronegativity difference. The pair that has the highest electronegativity difference represents the most polar bond.

Answer: 2

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