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Can a sigma bond be formed in the absenc...

Can a `sigma` bond be formed in the absence of `pi` bond ?

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yes
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(a) Explain sigma and pi bonds with suitable examples, (b) A pi bond cannot be formed in the absence of sigma bond. Discuss.

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Sigma bond is stronger than the pi bond. Explain.

Sigma Bond And Pi Bond

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. Compound having maximum bond angle is :

DINESH PUBLICATION-CHEMICAL BONDING AND MOLECULAR STRUCTURE -PROMBEMS FOR PRACTICE
  1. Which of the following molecules behave as electrical dipoles ? (i) ...

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  2. Out of and pi bonds, which is strong ?

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  3. Can a sigma bond be formed in the absence of pi bond ?

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  4. Can orbitals present in the 2p sub-sheel hybridise alone ?

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  5. What types of hybridisation are associated with central atom when the ...

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  6. Write the state of hybridisation of boron in BF(3^.)

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  7. How many sigma and pi bonds are present in the molecule of ethene ?

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  8. Mention the state of hybridisation of all the carbon atoms in he molec...

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  9. Assuming z-axis to be intermolecular axis, designate the molecule orbi...

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  10. Which of the follwing combinations are not permisible ? (i) 2pz and ...

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  11. Which combination will lead to pi-molecular orbitals ? (i) 2px-2px (...

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  12. Can 1s and 2s atomic orbitals from molecular orbitals

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  13. In the molecular orbital configuration of N(2) which orbital has lower...

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  14. What is the bond order of H(2)^(-) ion ?

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  15. Arrenge O(2),O(2)^(-),O(2)^(2-),O(2)^(+) in increasing order of bond e...

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  16. What will happen to the bond order if the electron is added ot bonding...

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  17. Why does a molecule of Ne(2) fail to exist ?

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  18. Predict the stability of a molecule if N(a) gtN(b).

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  19. What type of magnetic behaviour is shown by a molecule containing unpa...

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  20. Name a molecule for which bond order is 3.

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