Assertion -Rotation about C-C is restricted Reason- Electron charge cloud of the - bond is located above and below the lane of bonding atoms

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Standard XII

Chemistry

Interhalogen Compounds - Structures

Assertion :Ro...

Question

Assertion :Rotation about C=C is restricted Reason: Electron charge cloud of the $π$ bond is located above and below the lane of bonding atoms

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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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
In a $π$ bond formation, parallel orientation of the two p orbitals on adjacent atoms is necessary for proper sideways overlap. The p orbitals are mutually parallel and both the p orbitals are perpendicular to the plane of the molecule. Rotation of one $C H_{3}$ fragment with respect to other, interference with a maximum overlap of orbital and hence such rotation is restricted.
Thus, both Assertion and Reason are correct but the Reason is not the correct explanation oft he Assertion.

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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.

Assertion (A) Boiling points of alcohols and ethers are high.
Reason (R) They can form intermolecular hydrogen-bonding.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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

Statement-2 : Cyclobutadiene is aromatic and the