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The spatial part of the dominant resonance structure of the LiH molecule is (only valance part of the wavefunction is shown).

This question was previously asked in
CSIR-UGC (NET) Chemical Science: Held on (15 Dec 2019)
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  1. 2sLi(r1) 2sLi(r2)
  2. 2sLi(r1) 1sH(r2) + 2sLi(r2) 1sH(r1)
  3. 2sLi(r1) 1sH(r2) − 2sLi(r2) 1sH(r1)
  4. 1sH(r1) 1sH(r2)

Answer (Detailed Solution Below)

Option 4 : 1sH(r1) 1sH(r2)
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Detailed Solution

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Explanation:-

  • LiH is a polar molecule.
  • The spatial part of the dominant resonance structure of the LiH molecule is

1sH(r1) 1sH(r2)

  • This option represents the spatial part of the wave function for the Lithium-hydrogen (Li-H) bond.
  • In this structure, the 2s orbital of lithium (2sLi) interacts with the 1s orbital of hydrogen (1sH) on both atoms. This indicates the constructive combination of the two wavefunctions.

Conclusion:-

So, The spatial part of the dominant resonance structure of the LiH molecule is 1sH(r1) 1sH(r2)

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