Question

Short note on electrophillic and nucleophillic reagents

Answer 1

Electrophiles and Lewis Acids
An electrophile is a molecule that forms a bond to its reaction partner (the nucleophile) by accepting both bonding electrons from that reaction partner. Electrophilic reagents are Lewis acids. You've already seen that carbon dioxide is an electrophile. 

Nucleophiles and Lewis Bases
A nucleophile is a molecule that forms a bond with its reaction partner (the electrophile) by donating both electrons for that bond. Nucleophiles are Lewis bases. As you've seen, hydroxide is an example of nucleophile that adds to carbon dioxide.

Addition of Nucleophiles to the Carbonyl Group
Hydroxide, a nucleophile, adds to the electrophilic carbon of CO2. The purple arrows indicate the migration of a pair of electrons. First a pair of electrons moves from the nucleophile (hydroxide) to the electrophile (carbonyl carbon). Because carbon can't have more than 8 total electrons around it, a pair of electrons associated with the C=O unit must move to the oxygen atom.
Similarly, alcohols are nucleophiles that can add to the electrophilic carbon of an aldehyde.
After the addition of the nucleophile to the electrophile, there is an acid/base reaction. The acidic proton on the positively charged oxygen transfers to the basic, negatively charged oxygen. 

Answer 2

Hey mate...

Here is ur answer...

A nucleophille is a reactant that provides a pair of electrons to form a new covalent bond.
When the nucleophille donates a pair of electrons to a proton its called base.

An electrophille is a species that accept a pair of electrons to form a new covalent bond.
An electrophille that accepts a pair of electrons at hydrogen is called acid.


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