The electromeric effect is the movement of electrons from one atom to another as a reagent attacks a π bond. +E effect: In the positive electromeric effect the pi electrons of the multiple bond are transferred to that atom to which the attacking reagent is bonded. -E effect. This lesson will discuss inductive, mesomeric and electromeric effects with examples. We will also discuss some of the factors affecting electron.

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Chemistry | Organic Chemistry | – what is electromeric eff-askIITians

Bond Polarization – Eletromeric Effects. This effect is shown by those compounds containing multiple bonds.

The -E effect involves displacement of electrons away from the atom. This effect can best be represented as follows. Heterolytic fission results in the formation of charged species i. The atom obtaining the electrons attains a complete negative charge and the one that has lost the electrons develops a positive charge.

This involves a complete transfer of electrons.

Electromeric effect – Wikipedia

Please do send us a request for Electromeric Effect Bond Polarization tutoring and experience the quality yourself. As soon as the reagent is removed, the polarized molecule will come back to the original state.

In the meanwhile oxygen takes complete ecfect of the electron pair and becomes negatively charged. Thus, methyl with three hydrogen atoms shows a greater effect when compared to ethyl with only two such hydrogen atoms.

Solved problems Methyl amine is considered stronger than ammonia. As a result ,the atom X acquires a small negative charge and C 1 acquires a small positive charge. Electromeric effect Inductive effect Mesomeric effect Hyperconjugation Answer: Therefore, in the presence of attacking reagent, electfomeric bond is lost and this negatively charged attacking reagent links to the carbon having positive charge.


When the inductive effect and the electromeric effect operate in the same molecule, electromeric effect dominates the inductive effect. Leave a Reply Cancel reply Your email address will not be published. Addition of Cyanide ion to the carbonyl group. Unlike mesomeric and the inductive effects that are seen in compounds irrespective of the presence of the attacking agent, there are certain temporary effects that act only in the presence of the reacting agent.

After the transfer takes place, the reagent gets attached to the atom where the electrons have been transferred to. Fission of a covalent bond. By using this site, you agree to the Terms electromerid Use and Privacy Policy.

It usually occurs in polar covalent bond and is favoured by polar solvents. As can be seen above, the transfer of electrons takes place towards effec more electronegative atom.

They are not electromeeic effects but are permanent none Answer: The effect disappears as the attacking agent is removed.

Bond Polarization – Eletromeric Effects

Physical organic chemistry Chemical bonding Organic chemistry stubs. When a covalent bond joining two elecfromeric A and B breaks in such a way that both the electrons of the covalent bond are taken away by one of the bonded atoms, the mode of bond cleavage is called heterolytic fission.

There are two types of inductive effect: Our tutors who provide Inductive Effect of Hyperconjugation Bond Polarization help are highly qualified.


Electromeric effect is of two types: Homolytic fission usually occurs in non-polar bonds and is favoured by high temperatureultraviolet radiations and by the presence of radical indicators such as peroxides. However, this effect remains as long as the attacking molecule is present. Heterolytic fission is usually indicated by a curved arrow which denotes a two electron displacement.

The neutral chemical species which contain an odd or unpaired electron and which are produced by homolytic fission of covalent bonds are called free radicals. Electromeric effect Inductive effect Hyperconjugation Mesomeric effect Answer: As the electromeric effect is seen only in the presence of an attacking agent, this effect is said to promote the reactions rather than inhibiting them.

Inductive And Electromeric Effects

Please do send us the Inductive Effect of Hyperconjugation Bond Polarization problems on which you need Help and we will forward then to our tutors for review. This approach of breaking down a problem has been appreciated by majority of our students for learning Electromeric Effect Bond Polarization concepts.

This page was last edited on 25 Decemberat The most common attacking reagents that initiate the electromeric effect are the polar reagents.