Which chemical bond is most polar?

NY Regents Chemistry Exam June 2022

37 Which chemical bond is most polar? (1) a O–H bond in H2O

(2) a S–H bond in H2S

(3) a Se–H bond in H2Se

(4) a Te–H bond in H2Te

Explanation: 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 largest electronegativity difference represents the most polar bond.

Answer: 1