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Question: Answered & Verified by Expert
Assertion : Bond energy of $\mathrm{F}_2$ is lesser than $\mathrm{Cl}_2$. Reason : F-atom is smaller in size than $\mathrm{Cl}$.
ChemistryClassification of Elements and Periodicity in PropertiesAIIMSAIIMS 2019 (25 May)
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
2820 Upvotes Verified Answer
The correct answer is: If both assertion and reason are true and reason is the correct explanation of assertion.
Bond energy of $\mathrm{F}_2$ is lesser than $\mathrm{Cl}_2$ because atomic size of $\mathrm{F}$ is smaller and three lone pairs on each $\mathrm{F}$ - atom cause relatively greater repulsive interactions.

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