1.

Which of the following option are not in accordance with the property mentioned against them ?

Answer»

`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)""`Oxidising power
`MI gt MBR gt MCl gt MF""`Ionic character of metal halide
`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)""` Bond dissociation ENTHALPY
`HI lt HBr lt HCl lt HF""` Hydrogen-HALOGEN bond strength

Solution :Ionic character increases as the electronegativity of halogen increases, i.e., MI lt MBr lt MCl lt MF. Due to small size, the lone pair of electrons on the two F atoms repel each other and hence bond dissociation enthalpy of `F_(2)` is lower than that of `Cl_(2) and Br_(2)`. The actual order is : `Cl_(2) gt Br_(2) gt F_(2) gt I_(2)`. Thus, options (B) and (c) are not CORRECT.


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