Question

25. In which of the following compound resonance does not takes place?​

Answer 1

Since options aren't given, I'll mention the conditions to check whether in the given compound resonance takes place or not.

• The conditions to determine whether a compound is a resonance structure or not are:  
• Presence of conjugation in a plain.
• The resonating structure should differ in the position of bonds and electrons but not in terms of atoms.
• Example: a structure of benzene, kept in front of a mirror would account for another structure (though it may appear the same). This is what we call as resonance.

Answer 2

Resonance does not take place in compounds having unconjugated double bonds.

Explanation:

• Resonance is a phenomenon where there is real movement of electrons among the bonds and atoms of a molecule.

• Resonance is seen in a few cases like,

• A. There are conjugated double bonds and
• B. There is a double bond which is followed by a single bond and that single bond is followed by
• a. A double bond.
• b. A triple bond.
• c. A neutral atom with vacant orbital.
• d. A positively charged atom with vacant orbital
• e. A negatively charged atom.
• f. An atom with lone pair.
• g. An atom with free radicle.
• In each of these cases resonance occurs.
• Each stage of the resonance structure are called canonicals.
• The energy of the resonance hybrid is less than the average energy of the canonicals.

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Why resonance effect dominates over inductive effect in most of the cases?​