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