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NEET 2016
Exam
NEET
Year
2016
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

NEET 2016 · Chemistry · Classification of Elements and Periodicity in Properties

Which one of the following orders is correct for the bond...

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

Options

  1. AI2>Br2>Cl2>F2{I}_{2} > B{r}_{2} > C{l}_{2} > {F}_{2}
  2. BCl2>Br2>F2>I2C{l}_{2} > B{r}_{2} > {F}_{2} > {I}_{2}
  3. CBr2>I2>F2>Cl2B{r}_{2} > {I}_{2} > {F}_{2} > C{l}_{2}
  4. DF2>Cl2>Br2>I2{F}_{2} > C{l}_{2} > B{r}_{2} > {I}_{2}

Correct answer

B. Cl2>Br2>F2>I2C{l}_{2} > B{r}_{2} > {F}_{2} > {I}_{2}

Step-by-step solution

Decreasing order of Bond energy, Cl2>Br2>F2>I2C{l}_{2} > B{r}_{2} > {F}_{2} > {I}_{2}

The reason is anomalous behavior due to large electron - electron repulsion among the lone pairs in F2{F}_{2} molecule other than Cl2C{l}_{2} and Br2B{r}_{2} .

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