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What orbitals can overlap to form a sig...

What orbitals can overlap to form a `sigma`-bond and which orbitals can overlap to form a `pi`-bond?

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s-s,s-p,p-p for ` sigma `-bond and only p-p for `pi`-bond.
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Molecular orbitals are formed by the overlap of atomic orbitals. The combining orbitals must have proper orientation so that they can overlap to a considerable extent. Two atomic orbitals combine to form two molecular orbitals called bonding molecular orbital and antibonding molecular orbital. Bonding molecular orbital is stable and antibonding molecular orbital is unstable. sigma MO is formed by head on overlap while pi MO is formed by sidewise overlap. The MOs are filled with electrons according to the same rules as followed for filling atomic orbitats. Bond order is one of the most important parameter to compare the bond strength and bond length of bonds. Why has N_2 a larger dissociation energy than N_2 ^(+) whereas O_2 has a lower dissociation energy than O_(2)^(+) ?

Overlapping of 2 hybrid orbitals can lead to the formation of :

PRADEEP-CHEMICAL BONDING AND MOLECULAR STRUCTURE-ADDITIONAL QUESTIONS (VERY SHORT ANSWER QUESTIONS )
  1. On the basis of VSEPR theory, explain why ozone is a bent molecule and...

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  2. How does velence bond theory, explain the existence of H(2) but non-ex...

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  3. What orbitals can overlap to form a sigma-bond and which orbitals can...

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  4. Why free rotation about a pi-bond is not possible ?

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  5. Arrange in order of increasing bond strengths : F(2), N(2), O(2), Cl(2...

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  6. Arrange the molecules H(2), O(2), F(2) and N(2) in order of increasing...

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  7. Which of the following has maximum bond angle ? H(2)O, CO(2), NH(3), ...

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  8. Arrange the following in order of increasing ionic character : C-H,F...

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  9. Predict the dipole moment of a molecule of the type AX(4) with square ...

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  10. What are SI units of dipole moment?

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  11. Which of the following molecule/moleculas will have zero dipole moment...

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  12. Why covalent molecules show isomerism but ionic compound do not ?

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  13. What is the hybridisation of the central atom in (i) H(3)O^(+) (ii) Xe...

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  14. Name one compound each involving sp^(3) , sp^(2) and sp hybridisatio...

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  15. Name the shapes of the following molecules : CH(4) , C(2)H(2)m CO(2)

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  16. What type of hybridisation is involved in SF(6) ?

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

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  18. Give the structure of sulphur tetrafluoride .

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  19. BH(4)^(-) and NH(4)^(+) are isolobal . Explain.

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  20. State the type of hybrid orbitals associated with (i) P in PCl(5) and ...

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