Question

Identify electrpholic centre in the following RCHO , RCN and CH3X

Answer 1

electrophilic are electron deficient They carry positive charge RCHO are electropholic centre

Answer 2

   Electrophilic atoms are the electron deficient atoms in a molecule. These are the atoms which have vacant orbitals looking for electrons, or positively charged ions. Partially ionic compounds have electrophilic centers. As one of the two atoms in the bond, pulls away electrons towards it more, the other atom becomes an electrophilic center.

     Say H+, Cl2, Br2, many organic molecules etc.

   Electrophilic centers develop in the middle of reactions. So existing bonds break and new bonds form. 

                              H
                              |
 R CHO =       R -- C = O

    Oxygen is more electronegative than Carbon. So it attracts electron pairs towards itself. Hydrogen is also more electronegative than C. So it too attracts electron pair more towards it. So Carbon is the electrophilic center.

R C N  =     R  -- C  = N

    Nitrogen being more electronegative than Carbon, attracts electrons towards itself. So Carbon is the electrophilic center.

                          H
                           |
CH3 X   =   X -- C - H
                          |
                         H

   Hydrogen is more electronegative, due to smaller size, than Carbon. So Hydrogen atoms attract the electron pairs towards them. So Carbon is the electrophilic center.