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Assertion : sigma-bond is strong white p...

Assertion : `sigma`-bond is strong white `pi` -bond is a weak bond.
Reason :Atomic rotate freely about `pi`-bond.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
c
Rotation is hindered around `pi` - bond
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Sigma bond is stronger than the pi bond. Explain.

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A covalent bond will be formed by the overlapping of atomic orbitals having single electron of opposite spin, according to the overlapping of atomic orbitals the covalent bond may be of two types : (i) Sigma bond (sigma) " " (ii) Pi bond (pi) Sigma bond is stronger bond than the Pi-bond. If atomic orbitals overlap about the nuclear axis then sigma bond is formed but when atomic orbitals overlap sideway then Pi-bond is formed. The strength of bonds formed by 2s-2s,2p-2p and 2p-2s overlap has the order :

A covalent bond will be formed by the overlapping of atomic orbitals having single electron of opposite spin, according to the overlapping of atomic orbitals the covalent bond may be of two types : (i) Sigma bond (sigma) " " (ii) Pi bond (pi) Sigma bond is stronger bond than the Pi-bond. If atomic orbitals overlap about the nuclear axis then sigma bond is formed but when atomic orbitals overlap sideway then Pi-bond is formed. The correct order of increasing C-O bond length of CO,CO_(3)^(2-),CO_(2) is :

A2Z-CHEMICAL BONDING AND MOLECULAR STRUCTURE-Section B - Assertion Reasoning
  1. Assertion : Water is liquid but H(2)S is a gas. Reason : Oxygen is p...

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  2. Assertion: The first ionisation energy of Be is greater than that of B...

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  3. Assertion : sigma-bond is strong white pi -bond is a weak bond. Reas...

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  4. Assertion :H(2)O(2) is non - ionic compound. Reason : The O-O bond l...

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  5. Assertion : B(2) molecule is paramagnetic. Reason :The highest occup...

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  6. Assertion :First ionization energy is lower than oxygen. Reason :Ac...

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  7. Assertion (A): F-F bond in F(2) melocule is weak. Reason(B)F atom i...

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  8. Assertion :The S-S-S bond in S(8) molecule is 105^(@). Reason :S(8)...

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  9. Assertion : Bond order for CO is more than bond order in CO whereas bo...

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  10. Assertion : N(2)O is respented by (i) N = N = O and (ii) N= N rarr O ...

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  11. Assertion (A): Lithium chloride is predominantly covalent compound. ...

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  12. Assertion : CaF(2) is solution in water but CaI(2) not. Reason : CaF...

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  13. Assertion : O(3) and NO(2)^(-) are isoelectronic. Reason : Bond angl...

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  14. Assertion : NO(2) is readily dimerised to N(2)O(4) Reason :NO(2) has...

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  15. Assertion :Bothe Cu^(+) and Na^(+)have almost same radil. Reason :Cu...

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  16. Statement : p-dimethoxy benzene is polar molecule . Explanation : T...

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  17. Statement : The lattice energy of silver halids is AgF gt AgCl gt AgB...

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  18. Assertion : In CH(3)NCO, the angles C - N - C and N - C - O are not id...

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  19. Assertion : In IOF(4)^(-) a single lone pair is present an iodine atom...

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  20. Assertion : Molecular having different hybridisation can have same sha...

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