Mesomerism, also known as resonance, is a concept in chemistry that describes the delocalization of electrons within certain molecules. This phenomenon results in the stabilization of the molecule and a lower overall energy compared to the hypothetical structure without delocalization. The energy of mesomerism is the difference in energy between the actual molecule with delocalized electrons and the hypothetical structure without delocalization. This energy difference contributes to the overall stability and reactivity of the molecule. **

DMSO (Dimethylsulfoxide) exhibits mesomerism, also known as resonance, due to the delocalization of electrons within the molecule. The sulfur atom in DMSO has a lone pair of electrons that can be delocalized across the molecule, leading to resonance structures where the double bond can be shifted between the sulfur and oxygen atoms. This delocalization of electrons contributes to the stability of the molecule and its unique properties, such as its ability to solvate a wide range of compounds and its high polarity. **

The bromination of benzene involves the substitution of a hydrogen atom on the benzene ring with a bromine atom. This process occurs through an electrophilic aromatic substitution mechanism, where the bromine molecule acts as an electrophile. The mesomeric effect in this reaction refers to the delocalization of electrons within the benzene ring, stabilizing the intermediate carbocation formed during the reaction. This delocalization is facilitated by the resonance structures of the benzene ring, where pi electrons are shared among all carbon atoms in the ring, leading to increased stability. **

You can recognize if a molecule exhibits mesomerism by looking for the presence of multiple resonance structures. If a molecule can be represented by more than one valid Lewis structure, it exhibits mesomerism. Additionally, mesomeric structures often involve the delocalization of electrons, leading to the stabilization of the molecule. This can result in the molecule having unique properties, such as increased stability or reactivity. **

No, the breaking of sigma bonds does not belong to mesomerism. Mesomerism, also known as resonance, involves the delocalization of electrons within a molecule through the shifting of pi bonds and lone pairs. It does not involve the breaking of sigma bonds, which are the strong covalent bonds formed by the overlap of atomic orbitals. Breaking sigma bonds would involve the actual cleavage of the covalent bond, which is a different process than mesomerism. **

Coordinate bonding refers to a type of chemical bonding where both electrons in the bond come from the same atom. Delocalization occurs when electrons are spread out over multiple atoms or molecules, leading to increased stability. Mesomerism, also known as resonance, is a phenomenon where electrons are delocalized over multiple bonds in a molecule, resulting in multiple possible structures that contribute to the overall stability of the molecule. **

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