Bond dissociation energy of E - H bond of the " H 2 E " hydrides of group 16 elements (given…

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

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

H2O > H2 S > H2Se > H2Te.

Asked in: JEE Main 2023 (30 Jan Shift 2)

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