Question

Discuss resonance effect and its types.​

Answer 1

There are two types of Resonance effects namely positive resonance effect and negative resonance effect. Positive Resonance Effect- Positive resonance effect occurs when the groups release electrons to the other molecules by the process of delocalization. The groups are usually denoted by +R or +M.

Answer 2

Resonance Effect :- Resonance effect is the polarity produced in a molecule due to interaction between a lone pair of electron and a pi bond or it is produced due to interaction of two pi bonds between two adjacent atoms.

Types Of Resonance Effects

Two types of Resonance effects exist, namely:

1.Positive resonance effect

2.Negative resonance effect

Positive Resonance Effect

The positive resonance effect happens when the groups release electrons to the other molecules by the delocalization process. Usually, the groups are denoted by +R or +M - the molecular electron density increases in this process. The positive resonance effect examples are -OH, -OR,-SH, and -SR.

Negative Resonance Effect

The Negative resonance effect happens when the groups withdraw the electrons from the other molecules by the delocalization process. Usually, the groups are denoted either by -R or -M. The molecular electron density is said to decrease in this process. The negative resonance effect examples are, C=O, -COOH, -C≡N, and -NO2.