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Correct order of bond dissociation energ...

Correct order of bond dissociation energy

A

`Br_(2) gt Cl_(2)`

B

`F_(2) gt Cl_(2)`

C

`l_(2) gt F_(2)`

D

`F_(2) gt l_(2)`

Text Solution

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The correct Answer is:
To determine the correct order of bond dissociation energy for the dihalides (Cl2, Br2, F2, and I2), we need to analyze the bond strengths of these molecules based on their atomic properties. ### Step-by-Step Solution: 1. **Understanding Bond Dissociation Energy**: - Bond dissociation energy is the energy required to break a bond between two atoms in a molecule. Higher bond dissociation energy indicates a stronger bond. 2. **Analyzing the Dihalides**: - The dihalides in question are Cl2, Br2, F2, and I2. We need to compare their bond dissociation energies. 3. **Order of Bond Dissociation Energy**: - Generally, the bond dissociation energy decreases down the group in the periodic table. This is due to the increase in atomic size, which weakens the bond. - The order of bond dissociation energy for these dihalides is: - Cl2 > Br2 > F2 > I2 4. **Reasoning**: - **Cl2** has the highest bond dissociation energy because it has a strong bond with minimal repulsion between lone pairs. - **Br2** has a lower bond dissociation energy than Cl2 but is stronger than F2. - **F2** has a lower bond dissociation energy than Cl2 and Br2 due to the repulsion between the lone pairs of electrons on the fluorine atoms, which weakens the bond. - **I2** has the lowest bond dissociation energy because iodine atoms are larger, leading to a weaker bond. 5. **Conclusion**: - Therefore, the correct order of bond dissociation energy is: - Cl2 > Br2 > F2 > I2
To determine the correct order of bond dissociation energy for the dihalides (Cl2, Br2, F2, and I2), we need to analyze the bond strengths of these molecules based on their atomic properties. ### Step-by-Step Solution: 1. **Understanding Bond Dissociation Energy**: - Bond dissociation energy is the energy required to break a bond between two atoms in a molecule. Higher bond dissociation energy indicates a stronger bond. 2. **Analyzing the Dihalides**: ...
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