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BITSAT 2013
Exam
BITSAT
Year
2013
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

BITSAT 2013 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which of the following is incorrect with respect to property...

Which of the following is incorrect with respect to property indicated?

Options

  1. AE⋅N:F>Cl>Br\mathrm{E} \cdot \mathrm{N}: \mathrm{F} > \mathrm{Cl} > \mathrm{Br}
  2. B\quad E.A: Cl>F>Br\mathrm{Cl} > \mathrm{F} > \mathrm{Br}
  3. COxidising power : F2>Cl2>Br2\mathrm{F}_{2} > \mathrm{Cl}_{2} > \mathrm{Br}_{2}
  4. DBond energy : F2>Cl2>Br2\mathrm{F}_{2} > \mathrm{Cl}_{2} > \mathrm{Br}_{2}

Correct answer

D. Bond energy : F2>Cl2>Br2\mathrm{F}_{2} > \mathrm{Cl}_{2} > \mathrm{Br}_{2}

Step-by-step solution

F2\mathrm{F}_{2} is expected to have highest bond energy but the correct decreasing order is Cl2>Br2>F2\mathrm{Cl}_{2} > \mathrm{Br}_{2} > \mathrm{F}_{2} because of fluorine atom has very small size due to which there is a high inter electronic repulsion between two fluorine atoms so the bond between two fluorine gets weaker and need less energy.
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