Which of the above sketches correspond to TT (pi) character MOS? Count both T and TT* as s pi-character

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**Transcription for Educational Website:**

Consider the following sketches (1-8) representing molecular orbitals (MOs) obtained by combining the s and p atomic orbitals on two atoms. As usual, the white and grey lobes correspond to the opposite signs of the wavefunctions.

**Sketch Descriptions:**

1. **(1)**: Two circles overlapping, with areas of different shading (white and grey) indicating opposite signs of wavefunctions.
2. **(2)**: A circle overlapping with a pair of lobes, one white and one grey.
3. **(3)**: Two vertically elongated lobes, with one lobe shaded white and the other grey.
4. **(4)**: A diagram showing two lobes connected by a bridge, with different shading.
5. **(5)**: Two overlapping circles, with shading indicating opposite wavefunction signs.
6. **(6)**: A circle overlapping a pair of lobes, similarly shaded as in sketch (2).
7. **(7)**: Two vertically elongated lobes, similar to sketch (3), with shading to show opposite signs.
8. **(8)**: Two lobes connected by a central bridge, with different shadings on each side.

**Question:**
Which of the above sketches correspond to π (pi) character MOs? Count both π and π* as pi-character.

**Answer Options:**

- ○ 1, 2, 7, 8
- ○ 3, 4, 7, 8
- ○ 3, 7
- ○ 1, 7, 8
- ○ 4, 5, 6

**Explanation:**
Identify the sketches that represent molecular orbitals with π (pi) character, which involve side-to-side overlap of atomic orbitals, typical for p orbitals. Both bonding (π) and antibonding (π*) interactions should be considered.
Transcribed Image Text:**Transcription for Educational Website:** Consider the following sketches (1-8) representing molecular orbitals (MOs) obtained by combining the s and p atomic orbitals on two atoms. As usual, the white and grey lobes correspond to the opposite signs of the wavefunctions. **Sketch Descriptions:** 1. **(1)**: Two circles overlapping, with areas of different shading (white and grey) indicating opposite signs of wavefunctions. 2. **(2)**: A circle overlapping with a pair of lobes, one white and one grey. 3. **(3)**: Two vertically elongated lobes, with one lobe shaded white and the other grey. 4. **(4)**: A diagram showing two lobes connected by a bridge, with different shading. 5. **(5)**: Two overlapping circles, with shading indicating opposite wavefunction signs. 6. **(6)**: A circle overlapping a pair of lobes, similarly shaded as in sketch (2). 7. **(7)**: Two vertically elongated lobes, similar to sketch (3), with shading to show opposite signs. 8. **(8)**: Two lobes connected by a central bridge, with different shadings on each side. **Question:** Which of the above sketches correspond to π (pi) character MOs? Count both π and π* as pi-character. **Answer Options:** - ○ 1, 2, 7, 8 - ○ 3, 4, 7, 8 - ○ 3, 7 - ○ 1, 7, 8 - ○ 4, 5, 6 **Explanation:** Identify the sketches that represent molecular orbitals with π (pi) character, which involve side-to-side overlap of atomic orbitals, typical for p orbitals. Both bonding (π) and antibonding (π*) interactions should be considered.
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