Assertion :The carbon-carbon double bond energy in $C_{2} H_{4}$ is more than the carbon-carbon single bond energy in $C_{2} H_{6}$ . Reason: A $σ$ -orbital has greater electron overlap between the atoms because its component $σ$ -orbitals are directed toward each other, whereas the component $π$ -orbitals making-up the $π$ -orbital are directed perpendicular to the inter-nuclear axis.

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
Both the statements are true but the actual reason is: ethene has a double bond between the two carbon atoms, whereas ethyne has a carbon-carbon single bond. More energy is required to break a double bond in ethene than to break a single bond in ethyne. Therefore, the carbon-to-carbon bond energy in ethene is greater.

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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.

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

Q. Assertion : Bond order of

H_{2}^{+} is 0.5.

Reason : Electrons are removed from the antibonding molecular orbital from

H_{2} .

Assertion (A) Phenol forms 2, 4, 6-tribromophenol on treatment with $B r_{2}$ in carbon disulphide at 273K.
Reason (R) Bromine polarises in carbon disulphide.
(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.

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.

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