Which of the following orders is not correct with respects to the property indicated against each ?

Options

A. `F lt Cl lt Br lt I rarr` covalent radius
B. `F^(-) gt Cl^(-) gt Br gt I^(-)rarr` enthalpy of hydration
C. `F_(2) gt Cl_(2) gt Br_(2) gt I_(2) rarr` bond dissociation enthalpy
D. `F_(2) lt Cl_(2) lt Br_(2) lt I_(2) rarr X-X` bond length `( p m )`

Answer

C

Explanation

`(1)64lt 99 lt 114 lt 133-` covalent radius `//` pm down the group size increases due to addition of new shells.
`(2) 515 gt 391 gt 347 gt 305-Delta_("hyd")H(X^(-))KJ mol^(_1)`
Degree of hydration `prop (1)/("size of anion")`
`(3) 158.8 lt 242.6 gt 192.8 gt 1.51|-` Bond dissociation enthalpy `|KJ mol^(-1))F-F lt Cl-Cl` on account of large repulsion between non-bonded pairs of electron due to small F-F bond length.
`(4) 143 lt 199 lt 228 lt 266-X-X` dislance`//`pm as size of element increases the `X-X` distance increases.