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The energy of sigma(2s), is greater than...

The energy of `sigma_(2s)`, is greater than that of `sigma_(1s)^**` orbital because

A

`sigam 2s` is bigger than `sigma^(**) 1s MO`

B

`sigma 2s` is bonding whereas `sigma^(**)1s` is an `ABMO`

C

`sigma 2s` orbital has a greater value of than `sigma^(**) 1s MO`

D

`sigma 2s` orbital is formed only after `sigma^(**)1s` .

Text Solution

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The correct Answer is:
C
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Comprehension given below is followed by some multiple choice question, Each question has one correct options. Choose the correct option. Molecular orbitals are formed by the overlap of atomic orbitals. Two atomic orbitals combine to form two molecular orbitals called bonding molecular orbital (BMO) and anti-bonding molecular orbital (ABMO). Energy of anti-bonding orbital is raised above the parent atomic orbitals that have combined and hte energy of the bonding orbital is lowered than the parent atomic orbitals. energies of various molecular orbitals for elements hydrogen to nitrogen increase in the order sigma1s lt sigma^(star)1s lt sigma^(star)2s lt ((pi2p_(x))=(pi2p_(y))) lt sigma2p_(z) lt (pi^(star)2p_(x) = pi^(star)2p_(y)) lt sigma^(star)2p_(z) and For oxygen and fluorine order of enregy of molecules orbitals is given below. sigma1s lt sigma^(star)1s lt sigma2s lt sigma^(star)2s lt sigmap_(z) lt (pi2p_(x) ~~ pi2p_(y)) lt (pi^(star)2p_(x)~~ pi^(star)2py) lt sigma^(star)2p_(z) Different atomic orbitalsof one atom combine with those atoms orbitals of the second atom which have comparable energies and proper orientation. Further, if the overlapping is head on, the molecular orbital is called sigma, sigma andif the overlap is lateral, the molecular orbital is called pi, pi . The molecular orbitals are filled with electrons according to the same rules as followed for filling of atomic orbitals. However, the order for filling is not the same for all molecules or their ions. Bond order is one of the most important parameters to compare the strength of bonds. 67) Which of the following pair is expected to have the same bonod order?

CENGAGE CHEMISTRY-CHEMICAL BONDING AND MOLECULAR STRUCTURE-Exercises Single Correct (Molecular Orbital Theory (Mot))
  1. The species which does not show paramagnetism is .

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  2. Which of the following cannot exist on the basic of MO theory ? .

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  3. Which one paramagnetic and has a bond order of 0.5 ? .

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  4. The bond energies NO,NO^(o=) and No^(Theta) ion the highest occupied o...

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  5. In the MO diagram for O(2)^(Theta) ion the highest occupied orbital is...

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  6. Which of the following is not diamagnetic ? .

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  7. The bond order of CO and NO is .

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  8. Combination of two AO s lead to the formation of .

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  9. The possible molecular orbital formed when two d-orbitals overlap is .

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  10. Which of the following species exhibits the diamagnetic behaviour ?

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  11. Which of the following species is paramagnetic ? .

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  12. The bond order in NO is 2.5 while that in NO^(o+) is 3 Which of the fo...

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  13. When two AO s combine energy of bonding MO is lowered by x while of an...

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  14. In Which of the following the double bond consistts of the pi bonds .

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  15. Which of the following MOs has more than one nodal plane?

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  16. Which of the following MO's has zero nodal planes ? .

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  17. The main axis of diatomic molecule is z. The orbitals px and py overla...

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  18. The paramagnetic property of the oxygen molecule is due to the presenc...

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  19. Which of the following combination is not allowed in the LCAO method f...

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  20. The energy of sigma(2s), is greater than that of sigma(1s)^** orbital ...

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