Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AIIMS 2002
Exam
AIIMS
Year
2002
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

AIIMS 2002 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Assertion : F - F bond has low bond dissociation energy. Reason :...

Assertion : F - F bond has low bond dissociation energy. Reason : The fluorine has lower reactivity.

Options

  1. AIf both the assertion and reason are true and reason is a correct explanation of the assertion.
  2. BIf both assertion and reason are true but assertion is not a correct explanation of the assertion.
  3. CIf the assertion is true but the reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If the assertion is true but the reason is false.

Step-by-step solution

Lower value of bond dissociation energy of fluorine is due to the high inter electronic repulsions between non-bonding electrons of the 2p2 p-orbital of small sized fluorine. As a result F−F\mathrm{F}-\mathrm{F} bond is weaker as comparison to Cl−ClandBr−Br\mathrm{Cl}-\mathrm{Cl} and \mathrm{Br}-\mathrm{Br} bonds.  Bond dissociation energy F−F38 Kcal/moleCl−Cl57 Kcal/moleBr−Br45.5 Kcal/moleI−I35.6 Kcal/mole\begin{array}{lr}& \text{ Bond dissociation energy }\\ \mathrm{F}-\mathrm{F}& 38 \mathrm{~K} \mathrm{cal}/ \mathrm{mole}\\ \mathrm{Cl}-\mathrm{Cl}& 57 \mathrm{~K} \mathrm{cal}/ \mathrm{mole}\\ \mathrm{Br}-\mathrm{Br}& 45.5 \mathrm{~K} \mathrm{cal}/ \mathrm{mole}\\ \mathrm{I}-\mathrm{I}& 35.6 \mathrm{~K} \mathrm{cal}/ \mathrm{mole} \end{array}
Practice p Block Elements (Group 15, 16, 17 & 18) on Quantrex Academy →

More from p Block Elements (Group 15, 16, 17 & 18)

Identify the incorrect statement from the following : NEET 2026Given below are two statements: Statement-I : Heating NaCl with concentrated H _2 SO _4… NEET 2026Given below are two statements: Statement I : Like nitrogen that can form ammonia… NEET 2025Match List - I with List-II List-I List-II A. XeO_3 I. sp^3 d, linear B. XeF_2 II. sp^3… NEET 2025Among Group 16 elements, which one does NOT show -2 oxidation state? NEET 2024Identify the incorrect statement. NEET 2024The products A and B obtained in the following reactions, respectively, are aligned & 3… NEET 2024Given below are two statements: Statement I: The boiling point of hydrides of Group 16… NEET 2024 Full p Block Elements (Group 15, 16, 17 & 18) list All AIIMS PYQs