Arrange the following in the order of property indicated for each set:

$F_{2}, C l_{2}, B r_{2}, I_{2}$ - increasing bond dissociation enthalpy.

HF,HCl, HBr, HI- Increasing acid strength.

$N H_{3}, P H_{3}, A s H_{3}, S b H_{3}, B i H_{3}$ - increasing base strength.

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Solution

$I_{2} (151.1 k J m o l^{- 1})$ < $F_{2} (158.8 k J m o l^{- 1})$

< $B r_{2} (192.8 k J m o l^{- 1})$

(i) $< C l_{2} (242.6 k J m o l^{- 1}) - ---------------------- \to I n c r e a s i n g b o n d d i s s o c i a t i o n e n t h a l p y$

(ii) $H F < H C l < H B r < H I - -------------- \to I n c r e a s i n g a c i d s t r e n g t h$

(iii) $B i H_{3} < S b H_{3} < A s H_{3} < P H_{3} < N H_{3} - ------------------- \to I n c r e a s i n g b a s e s t r e n g t h$

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