JEE Main202330 Jan 2023Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual
Bond dissociation energy of E - H bond of the " H 2 E " hydrides of group 16 elements (given below), follows order. (A) O (B) S (C) Se (D) Te
Options
- AA > B > C > D
- BA > B > D > C
- CB > A > C > D
- DD > C > B > A
Correct answer
A. A > B > C > D
Step-by-step solution
Bond strength is inversely proportional to the bond length of E   -   H bond of hydrides of 16th group hydrides. The bond length increases down the group. Hence, bond dissociation enthalpy decreases down the group. Hence, bond dissociation energy of E - H bond in hydrides of group 16 follows the order H 2 O   >   H 2   S   >   H 2 Se   >   H 2 Te .