Assertion :Bond dissociation energy of $F_{2}$ is lesser than ${C l}_{2}$ . Reason: An additional $π$ -bond formation is created by donor-acceptor mechanism in ${C l}_{2}$ in which an unshared electron of one $C l$ -atom overlaps with a free $3 d$ -orbital electron of another $C l$ -atom

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Option (A) is correct.Explanation is correct reason for statement.
$F - F$ bond is short as fluorine atoms are extremely small. Thus it strengthens the repulsion between lone pair.Because of large electron-electron repulsion among the lone pairs in $F_{2}$ it weakens the bond.Hence Bond dissociation energy of $F_{2}$ is lesser than $C l_{2}$ .

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Similar questions

Q. Assertion : In the bonding molecular orbital (MO) of

H_{2}

, the electron density is increased between the nuclei.
Reason : The bonding MO is

ψ_{A} + ψ_{B}

, which shows destructive interference of the combining electron waves.

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

Q. Assertion : Bond order of

H_{2}^{+} is 0.5.

Reason : Electrons are removed from the antibonding molecular orbital from

H_{2} .

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Statement-1 : In (cyclobutadiene) all C-C bond lengths are equal.

Statement-2 : Cyclobutadiene is aromatic and the

Π

orbitals are orthogonal to each other.

The Assertion and Reason are given, you are required to choose any one of the following four responses.

A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C) The Assertion is correct but Reason is incorrect

D) Both Assertion and Reason are incorrect

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Assertion :Bond dissociation energy of F2 is lesser than Cl2. Reason: An additional π-bond formation is created by donor-acceptor mechanism in Cl2 in which an unshared electron of one Cl-atom overlaps with a free 3d-orbital electron of another Cl-atom

Assertion :Bond dissociation energy of $F_{2}$ is lesser than ${C l}_{2}$ . Reason: An additional $π$ -bond formation is created by donor-acceptor mechanism in ${C l}_{2}$ in which an unshared electron of one $C l$ -atom overlaps with a free $3 d$ -orbital electron of another $C l$ -atom