4 Resonance-4 Question Total Points Possible: 4 Which of the following statement

Question

4 Resonance-4 Question Total Points Possible: 4 Which of the following statements about resonance is/are true? (Select all that apply.) Molecules never exist as any of the individual resonance forms but as a blend of all of them. when drawing resonance forms a double-headed arrow is drawn between them. Resonance in a molecule generally indicates less stability. Molecules shift rapidly between resonance forms. Sigma bonds can be shifted when considering possible resonance forms Question 1 of 4 Points possible: 1 This is attempt 1 of 4. Next

Explanation / Answer

Resonance in a molecule leads to greater stability of the molecule. A molecule resonates between the different resonating structures in order to attain a greater stability; hence, the third statement is incorrect or false.

The different resonance structures of a molecule must have the same atom connectivities. Since sigma bonds denote atom connectivities, hence, the different resonance forms must have the same sigma bonds. Pie bonds, non-bonding electron pair(s) and excess electron(s) can be shifted in the different resonance structures, but not sigma bonds. Hence, the last statement is false.

Therefore, the correct statements about resonance are the first, second and fourth statements.

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