Re: Re: InterContinental University

Base attacks at more acidic protons while neucleophiles attacks at electron deficient carbon. Base is a specie that donates an electron pair or extracts a proton from othermolecule. A neucleophile is a specie that attack on positive or electron deficient site. Both base and neucleophile have excess of electrons.They may be negatively charged,neutral or partial negative portion of a polar molecule. The main difference between themis that a base extract H from other molecule and neucleophile attaches to the moleculeitself. It should be moved that a strong neucleophile is a weak base and vice versa.e.g. Chloride is a strong neucleophile due to its small size and electronegative nature butit is a weak base because it does not give electron pair easily (outermost electrons aretightly bound due to small size). Similarly, Iodide is a strong base but weak neucleophile due to large size.
A nucleophile is a species that shares a pair of electrons with another atom to form a
new covalent bond; a Lewis base. (Defining "nucleophile" as an electron pair donor is
not enough. A nucleophile has electron density readily available to share (usually lone pairs or pi
bonds), or at least have some incentive to share electron density (partial or full
negative charge).
Hope this helps!!! Nish.

--- On Sun, 3/27/11, Chaitanya Hari <[email protected]> wrote:

From: Chaitanya Hari <[email protected]>
Subject: [The Chemistry Cluster] Re: InterContinental University
To: [email protected]
Date: Sunday, March 27, 2011, 1:31 AM















 
 



  


    
      
      
      Hello  chemistry,

                             Plese explain the difference between a base and a nucleophile.



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