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NEET 2008
Exam
NEET
Year
2008
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

NEET 2008 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which one of the following arrangements does not give the correct...

Which one of the following arrangements does not give the correct picture of the trends indicated against it?

Options

  1. AF2>Cl2>Br2>\mathrm{F}_2>\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{I}2_2 : Oxidising power
  2. BF2>Cl2>Br2>\mathrm{F}_2>\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{I}2_2 : Electron gain enthalpy
  3. CF2>Cl2>Br2>\mathrm{F}_2>\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{I}2_2 : Bond dissociation energy
  4. DF2>Cl2>Br2>\mathrm{F}_2>\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{I}2_2 : Electronegativity

Correct answer

C. F2>Cl2>Br2>\mathrm{F}_2>\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{I}2_2 : Bond dissociation energy

Step-by-step solution

Key Idea : Generally bond dissaciation energies decreases in a group. Bond dissaciation energy also decreases with repulsion.
X-X BondF-FCl-ClBr-BrI-I
Bond length (Å))1.421.992.282.67
Bonddissociation</td></tr><tr><td>energy(kcal/mol)\begin{array}{l}Bond dissociation</td></tr><tr><td>energy (kcal / mol)\end{array}385745.535.6
Ingeneralthebonddissociationenergydecreasesasthebondlengthincreases,butthebonddissociationenergyofIn general the bond dissociation energy decreases as the bond length increases, but the bond dissociation energy of\mathrm{F}_2 is less than that of \mathrm{Cl}_2.Itisduetogreaterinterelectronicrepulsionsbetweenthelonepairofelectronsonthetwobondedfluorineatoms.Hence,theorderofbonddissociationenergyisas:It is due to greater interelectronic repulsions between the lone pair of electrons on the two bonded fluorine atoms. Hence, the order of bond dissociation energy is as :\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{F}_2>I\mathrm{I}_2$
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