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Bond dissociation energy of “E-H” bond of the “H2E” hydrides of group 16 elements (given below), follows order. A. O B. S C. Se D. Te Choose the correct order from the option given below :

1. A > B > C > D
2. B > A > C > D
3. A > B > D > C
4. D > C > B > A

Correct answer: A > B > C > D

Solution

The bond dissociation energy of the E-H bond in group 16 hydrides decreases from oxygen to tellurium due to increasing atomic size and decreasing electronegativity, which weakens the bond as the elements go down the group.

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