Electromeric Effect | Electrophiles and Nucleophiles

Electromeric effect is

The electromeric effect is

Fundamental Concepts In Organic Reaction Mechanism|Fission Of A Covalent Bond|Substrate And Reagent|Nucleophiles And Electrophiles|Electrophiles|Nucleophiles |Summary

What are electrophiles and nucleophiles ? Explain with examples.

Aldehydes and ketones react with electrophiles but not with nucleophiles.

Which of the following can act both as an electrophile and a nucleophile ?