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

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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

$H_{2} O > H_{2} S > H_{2} Se > H_{2} Te$ .

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